Category: Dermatology

Pain around the side of a toenail is typically assumed to result from onychocryptosis (an ingrown toenail), where the nail plate pierces the periungual skin. However, lateral nail fold pain can exist in the absence of true nail plate penetration. Understanding the underlying non-ingrown causes requires an appreciation of the complex anatomy of the nail unit and surrounding soft tissues, as well as recognition of mechanical, dermatological, neurological, and systemic influences.

Nail Unit Anatomy and Biomechanical Considerations

The toenail apparatus includes the nail plate, nail bed, nail matrix, hyponychium, and lateral and proximal nail folds. The great toe bears significant load during gait, with lateral pressure increasing during propulsion and toe-off phases. Chronic, repetitive microtrauma or footwear-related compression can produce pain at the lateral nail fold even without nail embedding. This biomechanical component often underlies many “non-ingrown” nail pain syndromes.

For example, ill-fitting shoes that narrow at the toe box can press the nail edge against periungual tissue. Over time, this creates inflammation, mild edema, and tenderness along the nail sulcus, often mistaken for early onychocryptosis. Biomechanical factors such as hallux valgus, digital deformities, or pes planus can redistribute pressure so that the lateral margin of the hallux nail receives greater shear forces during walking.

Common Non-Ingrown Causes

Several distinct clinical entities can explain pain at the side of the toenail without ingrowth:

• Traumatic or repetitive pressure injury: Chronic shoe compression or athletic activity (e.g., running or kicking sports) may irritate the lateral sulcus, leading to focal tenderness and erythema. The nail edge remains intact, but adjacent soft tissue becomes inflamed.
• Nail plate impingement from curvature: Some nails exhibit excessive transverse curvature (pincer nails or involuted nails). Even though the plate does not penetrate the skin, the curving edge can compress periungual tissue and elicit pain from pressure alone.
• Periungual callus or corns: Hyperkeratosis can develop along the nail fold due to chronic friction, producing localized pain that mimics an ingrown nail. In some cases, a nail wall corn (heloma molle or heloma durum) forms in the lateral groove where skin folds consistently rub together.
• Paronychia (without ingrowth): Acute or chronic paronychia may occur secondary to bacterial or fungal infection in the nail fold. Chronic paronychia often presents with swelling, tenderness, and erythema of the nail border, typically linked to moisture exposure or irritant damage weakening the cuticle barrier.
• Onychophosis: The accumulation of hyperkeratotic debris between the nail plate and lateral fold can produce significant discomfort, erosions, and inflammation, particularly in elderly patients or those wearing constrictive shoes. The condition is common and often overlooked.
• Psoriasis or eczema involving the nail folds: Inflammatory dermatoses may affect periungual tissues, causing erythema, scaling, and pain. Nail psoriasis may coexist with subungual hyperkeratosis or pitting, leading patients to attribute discomfort mistakenly to a mechanical cause.
• Subungual exostosis or osteochondroma: A benign bony outgrowth beneath the distal nail bed can elevate part of the nail plate, altering local pressure distribution. This causes localized tenderness, especially along the lateral edge, sometimes before visible nail change occurs.
• Neuropathic pain: Localized nerve irritation, such as from trauma or peripheral neuropathy, may manifest as burning or shooting pain around the nail despite normal skin and nail appearance.
• Foreign body or micro-splinter: Tiny fragments (e.g., sock fibres or debris from pedicures) can lodge beneath the lateral sulcus, provoking inflammatory reactions without clear external entry sites.

Diagnostic Approach

Accurate diagnosis begins with careful clinical assessment and differentiation between mechanical, inflammatory, and structural causes. A thorough history and physical examination should note:

• Location and quality of pain (sharp, throbbing, or burning)
• Triggers (e.g., footwear, activity, water exposure, chemical irritants)
• Nail curvature and fold morphology
• Evidence of infection, drainage, or hypertrophic tissue
• Nail plate deformities, thickening, or color change
• Past trauma or history of systemic skin disease

Dermatoscopic or magnified inspection can help distinguish an embedded edge (true ingrown toenail) from non-penetrating variants. Probing gently beneath the nail margin determines whether the nail plate breaches the epithelium. Radiographs may be indicated when subungual exostosis is suspected, especially if chronic pain persists or nail elevation is visible.

In selected cases, microscopy or culture can confirm fungal or bacterial involvement, and a skin scrape or biopsy may help diagnose inflammatory or psoriatic nail disease.

Management Strategies

Management depends on the underlying cause. When ingrown toenail is excluded, conservative approaches generally focus on relieving pressure, reducing inflammation, and addressing contributing biomechanical or dermatological factors.

1. Footwear modification

Wider toe-box shoes are often the simplest and most effective intervention. They decrease lateral nail fold compression and prevent further microtrauma. Patients should avoid tight-fitting dress shoes or narrow sports footwear.

2. Nail care and debridement

Reducing nail plate thickness and curvature via professional podiatric care can relieve pressure. Careful removal of onychophosis or hyperkeratotic debris from the lateral groove often gives immediate pain relief. Emollients containing urea (10–25%) can soften keratotic build-up, while antiseptic or antifungal preparations may help manage chronic paronychia.

3. Padding and protective devices

Silicone toe sleeves, digital spacers, or custom padding can offload pressure from the affected fold. For individuals with structural deformities, orthoses or footwear adjustments targeting forefoot loading patterns may prevent recurrence.

4. Management of infection and inflammation

Topical antiseptics (e.g., povidone-iodine) or topical antibiotics can treat localized bacterial infection. Inflammatory dermatoses such as psoriasis or eczema respond to topical corticosteroids or calcineurin inhibitors applied to the periungual skin. Chronic paronychia benefits from reducing wet work exposure, applying barrier creams, and maintaining a dry environment.

5. Addressing structural causes

In cases of pincer or involuted nails, gradual flattening techniques such as orthonyxia (nail bracing) may relieve pain and guide normal growth. Surgical nail correction is reserved for severe or recurrent curvature not responsive to conservative measures. Subungual exostosis requires surgical excision once confirmed radiographically.

6. Neuropathic or idiopathic pain

If symptoms appear disproportionate to physical findings, neuropathic mechanisms should be considered. Gabapentin, topical lidocaine, or desensitization strategies may be appropriate in selected cases after ruling out local tissue pathology.

Clinical Vignettes

Consider a 38-year-old runner presenting with lateral border tenderness of the hallux nail, showing no embedding or drainage. The nail curvature is exaggerated, and compression testing elicits pain along the groove. Diagnosis: involuted nail causing pressure on the sulcus. Management with footwear modification, gentle edge thinning, and silicone sleeve resolved symptoms.

A second case involves a 64-year-old gardener with chronic swelling and tenderness along both hallux nail edges. Culture revealed Candida species. Chronic paronychia linked to moisture exposure—treated effectively with topical antifungal therapy and protective gloves during gardening.

Preventive Considerations

Preventing lateral nail fold pain relies on consistent nail and footwear care. Nails should be cut straight across with slightly rounded corners to avoid sharp spicules that can irritate periungual skin. Patients should be advised against aggressive digging or trimming down the sides of nails, as this often initiates inflammation that mimics early onychocryptosis. Regular monitoring is important for athletes, tradespeople, or individuals with deformities altering forefoot load, as they remain at higher risk for recurring periungual pain.

Pain at the side of a toenail does not always equal an ingrown nail. Instead, it encompasses a spectrum of conditions ranging from pressure-induced hyperkeratosis to inflammatory skin disease and neuropathic irritation. Careful assessment guided by nail morphology, surrounding tissue changes, and mechanical influences is essential for distinguishing these aetiologies. Podiatric management should aim to alleviate pressure, correct structural or footwear issues, and treat any infection or inflammation while educating patients on ongoing preventive care.

Understanding these non-ingrown causes of toenail pain broadens diagnostic accuracy and enhances care outcomes, reducing unnecessary procedures and ensuring symptoms are managed at their source.

Ingrown toenails are a common and painful condition in which the edge of a toenail grows into the surrounding skin, most often on the big toe. Effective treatment ranges from simple self‑care at home to minor surgical procedures in a clinic, depending on how severe the problem is and whether infection is present.

What is an ingrown toenail?

An ingrown toenail occurs when the nail plate curves and presses or pierces into the adjacent skin of the nail fold. This causes local inflammation, redness, swelling and tenderness, and can progress to infection with pus and overgrowth of tissue if not managed. People who trim nails too short or rounded, wear tight shoes, or have naturally curved/thick nails are particularly prone to the problem. Recurrent episodes are common if the underlying cause is not corrected.

Mild cases and home treatment

For early or mild ingrown toenails, conservative treatment at home is often sufficient. The aim is to reduce inflammation, relieve pressure from the nail edge, and guide the nail to grow straight out rather than into the skin. A typical first step is to soak the foot in warm water for 15 to 20 minutes several times a day, sometimes with Epsom salt or mild soap to soften the skin and nail and to help reduce discomfort. After soaking, gently drying the foot and using a clean cotton bud to nudge the swollen skin away from the nail edge can help free the nail margin.

Some people place a tiny wisp of cotton or dental floss under the very edge of the nail after soaking. This lifts the nail slightly away from the skin so it can grow over, rather than into, the nail fold. The material must be changed daily and kept clean to reduce the risk of infection. During this period, it is important to wear roomy footwear or open‑toed sandals so that there is no extra pressure on the affected toe. Simple pain relievers such as paracetamol or ibuprofen can be used if needed, provided there are no medical reasons to avoid them.

When medical care is needed

If pain is significant, the nail fold looks very red or swollen, there is pus, or home care fails over a few days, professional treatment is recommended. A doctor or podiatrist can confirm the diagnosis and rule out other problems such as fungal nail disease, trauma or, in people with diabetes, more serious infections. They may gently lift the ingrown edge and place a small piece of cotton, dental floss or a specialized splint beneath it to keep it elevated. Sometimes a topical corticosteroid cream is prescribed to reduce inflammation around the nail once the toe has been soaked.

Infected ingrown toenails can require additional measures. If there is spreading redness, warmth extending beyond the toe, or systemic symptoms such as fever, oral antibiotics may be indicated. However, for many localized infections, proper drainage, removal of the offending nail edge and good local wound care are the most important components of treatment. People with poor circulation, diabetes, or immune problems should seek medical help early, as even a minor ingrown toenail can lead to serious complications in these groups.

Surgical treatment options

Moderate to severe or recurrent ingrown toenails are often best managed with minor surgical procedures under local anaesthetic. The most common method is partial nail avulsion, in which the clinician removes a narrow strip from the side of the nail that is growing into the skin. This immediately relieves pressure and allows inflamed tissue to settle. In many cases, this procedure is combined with destruction of the corresponding part of the nail matrix (the root that produces the nail) so that the removed strip does not grow back.

Matrix destruction can be performed chemically, most often by applying phenol, or mechanically by cutting out the matrix tissue or using electrocautery or laser. Chemical matricectomy with phenol after partial nail avulsion has been shown to reduce the risk of the ingrown edge recurring, although it may slightly increase short‑term drainage and risk of minor infection compared with simple excision. Alternative technologies such as radiofrequency or carbon dioxide laser aim to achieve the same result with less bleeding and possibly quicker recovery.

Aftercare and recovery

After a surgical procedure, the toe is usually dressed with a sterile bandage, and patients are advised to rest and keep the foot elevated for the first day. Mild bleeding and oozing can continue for a few days as the area heals. The dressing is typically changed daily or as instructed, with gentle cleaning in warm water and re‑application of a clean, dry bandage. Most people can resume normal walking within a day or two, but tight or restrictive footwear should be avoided until tenderness and swelling subside.

Pain after partial nail avulsion is usually modest and can be controlled with oral pain relievers. The remaining nail often looks slightly narrower than before but generally functions normally and grows out in a way that avoids the previous problem side. It is important to attend any recommended follow‑up appointments so the clinician can check healing and address any early signs of infection or recurrence.

Prevention and long‑term care

Preventing future ingrown toenails is an important part of treatment, especially for those who have had repeated episodes. Correct nail‑cutting technique is central: toenails should be trimmed straight across, with the corners left visible rather than cut into a curve, and not cut excessively short. Using clean, sharp clippers and avoiding tearing or ripping the nail reduces the chance of leaving sharp spikes that can penetrate the skin. Good foot hygiene, including keeping the feet dry and changing socks regularly, helps lower the risk of infection.

Footwear choice also matters. Shoes with a wide toe box that do not compress the toes together, and avoiding high heels or narrow shoes for long periods, can significantly lower pressure on the nails. People engaged in sports that involve repeated toe trauma, such as football, running or ballet, may need specially fitted shoes or protective padding. Those with conditions that impair sensation or circulation, such as diabetes, should have regular foot checks by a health professional and seek early advice at the first sign of nail problems.

In summary, ingrown toenails can usually be treated effectively with a combination of self‑care, conservative clinical measures and, when necessary, minor surgical procedures. Understanding how they develop, knowing when to escalate from home remedies to professional care, and following sound preventive habits are key to reducing pain, infection and recurrence over the long term.

Friar’s balsam, or compound benzoin tincture, is a traditional resin‑based preparation that has persisted into modern practice as a niche but useful topical agent for selected foot conditions. In podiatry it is used far less as a “panacea” than in the past, but remains relevant as both an adhesive enhancer for padding and dressings and as a mild antiseptic and protectant for superficial lesions and fissures.

Composition and pharmacological actions

Friar’s balsam is a solution of benzoin resin in ethanol, with additional balsamic resins such as storax, Tolu balsam and aloe, giving it characteristic antiseptic, astringent and film‑forming properties. The alcohol vehicle facilitates rapid evaporation, leaving a thin resinous film that adheres to the stratum corneum and increases surface tack.

The benzoin and related resins contain esters and free cinnamic and benzoic acids, compounds long associated with weak antimicrobial and antiseptic effects. When applied to intact or minimally disrupted skin, the evaporating alcohol has a transient drying, cleansing effect, while the residual film acts as a protectant, reducing minor friction and contamination over small wounds, fissures or chapped skin. However, these same resins are also well‑recognised contact allergens, which places practical limits on widespread use.

Historical and modern indications

Historically Friar’s balsam was promoted as a near‑universal topical remedy for “wounds of all kinds, bruises, and all skin disorders”, and even taken internally for problems as diverse as worms, haemorrhoids and “cardiac disease”. Contemporary regulatory indications are far narrower, with the product listed in Australia, for example, as an antiseptic for minor cuts and abrasions and as a symptomatic treatment for common colds when inhaled as steam.

For foot care, modern over‑the‑counter descriptions emphasise its use as an antiseptic protectant for minor cuts and abrasions, chapped skin, small skin fissures and bedsores, and to relieve itch associated with chilblains and mild eczematous conditions. In practice this translates to typical podiatric scenarios such as superficial heel fissures, minor interdigital splits, small periungual cracks and low‑grade excoriations where a light, protective barrier is useful but heavy occlusion is undesirable.​

Role as an adhesive enhancer in foot care

Within podiatry and sports medicine, Friar’s balsam is now best known for its role as an adhesive enhancer under taping and padding on the foot. When applied sparingly to clean, dry, intact skin and allowed to dry for 30–60 seconds, compound benzoin tincture markedly increases the bond strength of adhesive tapes, dressings, felt and foam padding, particularly in high‑friction, high‑sweat environments such as the plantar forefoot and heel.

This property is especially valuable in:

• Management of friction blisters: ensuring that prophylactic tapes and hydrocolloid dressings remain adherent on macerated or sweaty skin during running, hiking or field sports.
• Off‑loading corns and calluses: helping semi‑compressed felt or foam pads remain in situ over bony prominences like metatarsal heads or toe dorsum for longer between changes.
• Securing post‑operative or post‑debridement dressings: improving adherence around toes and plantar surfaces where conforming dressings tend to lift.blister-prevention+1​

However, the very stickiness that makes Friar’s balsam useful can also raise local friction if used over too large an area: exposed resin can attract sock fibres and grit as the foot perspires, increasing the coefficient of friction and, paradoxically, the risk of blisters. Clinically, this necessitates highly targeted application limited to the footprint of the intended tape or pad, with any exposed areas dusted with powder or covered to prevent unwanted traction.

Use for fissures, chapping and minor lesions

Product information from several manufacturers highlights Friar’s balsam as a topical protectant for “chapped skin and lips, cracked nipples, small skin fissures and bedsores”, with additional claims of relieving itching in chilblains, eczema and urticaria. Transposing these indications to the foot, potential uses include:

• Small, superficial heel fissures or peri‑fissure skin where a light film may reduce further splitting and contamination once bleeding has ceased.
• Mild periungual cracks or interdigital fissures secondary to irritant dermatitis or cold exposure, if the surrounding skin is otherwise intact.
• Low‑grade chilblain itch on toes, as an adjunct to standard warmth and vascular‑protective measures, noting that the evidence is experiential rather than trial‑based.

Nevertheless, the alcohol base will sting intensely on open blisters, abrasions or actively exuding eczema. Best practice is therefore to restrict application to intact or nearly healed skin around a lesion, and to rely on more conventional emollients, barrier creams and appropriate dressings for substantive fissures, ulcers or dermatitis.

Risks, contraindications and patient selection

The major clinical limitation in using Friar’s balsam on the feet is the risk of dermatitis. Allergic contact dermatitis to the balsamic resins (benzoin, storax, Tolu balsam) is well documented and considered the most important adverse effect, often presenting with delayed pruritic, eczematous eruptions 24–72 hours after exposure. Once sensitised, patients are likely to exhibit cross‑reactivity with other fragrance mixtures and Balsam of Peru, creating persistent difficulties with many cosmetics and topical products.biomedicus​

Irritant contact dermatitis is also possible, driven by the high alcohol content and resin load, and typically presents as immediate burning and erythema at the site of application, particularly on already compromised skin. Product information also notes that frequent or widespread application can cause skin dryness and cracking, an undesirable effect on already vulnerable plantar skin.file2.

Other safety considerations include:

• Avoidance on broken or significantly inflamed skin, given stinging, potential irritancy and theoretical risk of increased systemic absorption.
• Caution in atopic patients or those with known fragrance or Balsam of Peru allergy, where the sensitisation risk is high.
• Avoidance of use as an inhalant in individuals with asthma or significant respiratory disease, due to the potential for bronchospasm.

In podiatric settings, patch‑testing a small area before wider use may be prudent in patients with complex dermatological histories, and practitioners should counsel patients to discontinue use and seek review if any rash, intense itching or blistering develops.

Place of Friar’s balsam in contemporary podiatry

In modern evidence‑based foot care, Friar’s balsam occupies a modest, adjunctive role rather than a central therapeutic position. Its primary contemporary value lies in:

• Enhancing the adherence and durability of tapes, dressings and off‑loading pads in challenging high‑moisture, high‑friction environments such as athletic or occupational feet.
• Providing mild antiseptic and protective film effects for minor, superficial lesions and fissures, when used judiciously on nearly intact skin.

Balanced against this are the relatively high rates of irritant and allergic contact dermatitis and the availability of alternative adhesive enhancers and barrier products (such as colourless skin‑prep wipes) that may offer similar benefits with less mess and potentially lower allergenicity. For the podiatric clinician, Friar’s balsam is therefore best considered a specialised tool: useful in selected patients and specific foot‑care scenarios, but always deployed with restraint, targeted application and awareness of its sensitising potential.

Foot odour is usually very treatable with good hygiene, smart footwear choices, and a few simple home or medical remedies. An effective 1000‑word essay on treating foot odour should explain what causes the smell, how to change daily habits, which treatments work at home, and when to see a health professional for further help.

Understanding foot odour

Foot odour (bromodosis) develops when sweat from the feet is broken down by skin bacteria into strong‑smelling acids. Sweat itself is odourless, but closed shoes, synthetic socks and long hours on your feet trap moisture and create a warm, damp environment where bacteria and sometimes fungi thrive.

Several factors increase the risk of smelly feet, such as naturally sweaty feet, hormonal changes in teenagers, pregnancy, and medical conditions like hyperhidrosis that cause excessive sweating. Re‑wearing shoes without letting them dry, not washing or drying feet properly, and leaving dead, hard skin on the soles give bacteria more surfaces and “food” to grow on, which intensifies the smell.

Daily hygiene measures

Treating foot odour starts with consistent hygiene, because reducing sweat and bacteria directly reduces odour. Feet should be washed at least once daily with soap and water, paying special attention to between the toes, then dried thoroughly, especially in those spaces where moisture easily lingers.

Removing thick or hard skin with a pumice stone or foot file once or twice a week helps because soggy, softened callus provides an ideal home for bacteria. Keeping toenails short and clean removes trapped dirt and sweat, and using a clean towel for the feet and changing it frequently prevents re‑introducing bacteria each day.

Home treatments and products

Simple foot soaks are a common and effective home treatment that can be added to daily washing. Epsom salt soaks, typically half a cup of salt in warm water for 10–20 minutes, draw moisture out of the skin and make it harder for bacteria to flourish on the feet.

Vinegar soaks made with one part white or apple‑cider vinegar to two parts warm water once or twice a week can make the skin surface more acidic and less friendly to bacteria, though they should be avoided on broken or irritated skin. Some podiatry resources also suggest tea soaks containing tannic acid, which can mildly tighten the skin and reduce sweating, but these should be used cautiously in people with sensitive skin.

Footwear, socks, and shoe care

Changing what is worn on the feet is just as important as washing, because shoes and socks often hold most of the moisture and bacteria. Socks made of natural or moisture‑wicking fibres, changed at least once a day or more often if they become damp, help keep feet drier than thin synthetic socks that trap sweat.

Shoes should be rotated so each pair can dry fully for at least 24 hours before being worn again, and open‑toed or breathable shoes are better choices in warm weather. Spraying the inside of shoes and removable insoles with an antibacterial or disinfectant spray and allowing them to dry thoroughly helps kill lingering bacteria, while storing shoes in a dry, ventilated, sunny area further discourages bacterial growth.

Medical help and prevention

When home measures do not control the smell, or when there is redness, itching, cracking skin or pain, professional assessment is important. Persistent odour can signal fungal infections such as athlete’s foot, nail fungus, or underlying conditions like diabetes and hyperhidrosis, which may need prescription creams, stronger antiperspirants, or other targeted treatments.

Long‑term prevention focuses on maintaining the same good habits that treat the problem: regular washing and drying, routine exfoliation, clean socks and rotating shoes, and occasional soaks or use of foot antiperspirants if sweating is heavy. By combining hygiene, appropriate footwear, and timely medical advice when needed, most people can control foot odour effectively and keep their feet comfortable and socially acceptable in day‑to‑day life.

Erosio interdigitalis blastomycetica (EIB) is a characteristic form of candidal infection that affects the skin between the toes and, less commonly, the fingers. In the feet, it is an important cause of painful, macerated interdigital lesions that can easily be mistaken for tinea pedis or simple “skin maceration”.

Definition and overview

EIB is an interdigital infection caused predominantly by Candida albicans, a yeast that normally colonises human skin and mucosa but becomes pathogenic in warm, moist, occluded environments. In the toes it typically presents in the web spaces, most often between the fourth and fifth toes, where friction and trapped moisture compromise the stratum corneum. The term itself reflects its pathology: “erosio” (erosion), “interdigitalis” (between digits), and “blastomycetica” (due to budding yeast), emphasizing the characteristic eroded lesion produced by a yeast infection. Clinically, it is viewed as a specific form of cutaneous candidiasis, sometimes grouped under interdigital candidiasis rather than as a distinct entity.

Epidemiology and risk factors

EIB can occur in any age group but is more frequently described in adults whose feet are chronically wet or occluded. People who wear tight, non‑breathable footwear for long hours (for example workers in rubber boots or closed safety boots) are particularly at risk, as the combination of sweating and poor ventilation provides ideal conditions for yeast proliferation. Systemic factors also matter: diabetes mellitus, obesity, peripheral oedema, and states of immune compromise all predispose to candidal skin infections, including EIB, by impairing local defence and promoting chronic moisture and skin breakdown. In addition, occupational or lifestyle habits that involve prolonged exposure to water or repeated washing, without adequate drying between the toes, increase the likelihood of disease.

Pathogenesis

The pathogenesis of EIB begins with damage to the interdigital stratum corneum from friction, moisture, and maceration. As the keratin barrier softens and breaks down, Candida albicans, already present as a commensal organism on the skin or introduced from other colonised sites, can invade the superficial epidermis. Yeast cells and pseudohyphae proliferate in the macerated keratin, triggering an inflammatory response that results in erythema, erosion, and further disruption of the barrier. The interdigital cleft, where opposing skin surfaces remain in close contact, maintains high humidity and warmth, sustaining the infection and hindering spontaneous resolution. Secondary bacterial colonisation, sometimes by Gram‑negative organisms, can complicate the picture and exacerbate odour, pain, and exudate, further enlarging the erosive lesion.

Clinical features in the feet

On the feet, Erosio interdigitalis blastomycetica most often affects one or more web spaces, classically presenting as an oval or fissured area of red, denuded skin surrounded by a rim of white, soggy, macerated epidermis. The lesion tends to look “raw” and moist, with surrounding whitish, peeling skin that may extend along the sides of adjacent toes. Patients typically complain of itching, burning, and tenderness, which can be aggravated by walking, standing, or wearing shoes. A foul odour is common when there is substantial maceration or bacterial co‑infection, and the area may crack or fissure, leading to sharp pain on weight bearing. In chronic or recurrent cases, the skin may show persistent scaling and intermittent erosions, and small vesicles or pustules may appear at the periphery, reflecting ongoing inflammation and superficial infection.

Differential diagnosis

Accurate diagnosis requires distinguishing Erosio interdigitalis blastomycetica from several other interdigital dermatoses of the feet. Tinea pedis, caused by dermatophytes, can also produce maceration and scaling between the toes, but often has drier, more powdery scaling and typically lacks the pronounced “raw” central erosion and odour associated with candidal infections. Interdigital erythrasma, due to Corynebacterium minutissimum, may present as macerated, reddish‑brown patches but characteristically fluoresces coral‑red under Wood’s lamp examination. Irritant or allergic contact dermatitis tends to show more diffuse erythema and scaling without the sharply demarcated, eroded centre, while soft corns (heloma molle) are painful focal hyperkeratoses rather than broad erosions. Bacterial intertrigo and simple soak maceration can resemble Erosio interdigitalis blastomycetica but often lack the pruritus, candidal pseudohyphae on microscopy, and classic white rim of macerated skin around a central erosion.

Diagnosis

Diagnosis is primarily clinical, based on the typical interdigital location and appearance of a macerated white rim surrounding an erythematous, eroded centre. However, because it mimics tinea pedis and other conditions, simple office investigations are important. Scraping from the affected web space can be examined in potassium hydroxide (KOH) preparation to look for budding yeast and pseudohyphae, confirming candidal involvement. Culture on appropriate media allows species identification and may reveal concomitant dermatophytes or bacteria, which can influence treatment choices. In atypical, resistant, or severe cases, a skin biopsy may be performed to rule out psoriasis, chronic eczema, or other dermatoses, and to demonstrate the presence of yeast organisms in the stratum corneum. Assessment of contributing systemic factors, such as hyperglycaemia in diabetics or oedema from venous disease, is also a key part of the diagnostic work‑up.

Management and treatment

Effective management of Erosio interdigitalis blastomycetica in the feet combines antifungal therapy with rigorous control of moisture and predisposing factors. Topical antifungals, such as azole creams or solutions (for example clotrimazole or miconazole), are usually first‑line and are applied to the affected web spaces and surrounding skin for several weeks, continuing briefly after apparent clinical resolution to reduce relapse. In situations with marked maceration, powders or solution formulations may be preferable to creams, as they help keep the area dry and reduce friction. If topical therapy fails, is poorly tolerated, or if the infection is extensive or recurrent, systemic antifungals such as fluconazole or itraconazole can be prescribed, taking into account liver function and potential drug interactions. Treatment should also target any secondary bacterial infection, using topical or systemic antibiotics when indicated.

Prevention and patient education

Prevention of recurrence is central, given the tendency of Erosio interdigitalis blastomycetica to reappear when moisture and occlusion persist. Patients are advised to wash feet daily with gentle cleansers and, most importantly, to dry thoroughly between each toe using a towel or even absorbent cotton or gauze. Choice of footwear is critical: breathable shoes made from materials that allow evaporation, combined with moisture‑wicking socks that are changed whenever damp, markedly reduce interdigital humidity. For individuals with occupational exposure to water or to prolonged boot wear, scheduled “dry‑out” breaks, use of antifungal or drying powders, and rotation of footwear can help maintain a drier environment. Addressing systemic risk factors, such as optimising glycaemic control in diabetes and managing oedema, further lowers susceptibility. Educating patients on early symptoms—itching, whitening of the web space, mild soreness—encourages prompt self‑care and early medical review, which can prevent progression to painful erosions and complications.

Electric callus removers are handheld, motorized devices designed to file away thick, hardened areas of skin, most commonly on the heels, balls of the feet, and sides of the toes. They aim to provide smoother, more comfortable skin than manual tools with less physical effort and more consistent results. When used correctly, they can be a convenient part of a regular foot‑care routine, but they also have limitations and safety considerations users need to understand.

How electric callus removers work

Most electric callus removers use a rotating or oscillating abrasive head, usually made from mineral particles such as quartz or similar materials, to gently grind down thickened skin. The device is moved over the callused area for a few seconds at a time, letting the spinning roller or disc wear away layers of dead skin without the user needing to press hard. Many models now offer multiple speed settings and interchangeable heads of different coarseness so that treatment can be adjusted for light maintenance or very thick calluses.

These devices are typically powered either by replaceable batteries or by built‑in rechargeable batteries that can provide between 45 and 60 minutes or more of use on a full charge. Newer designs often include ergonomic handles, cordless operation, and features such as waterproof or water‑resistant casings to allow use in the bathroom and easier cleaning under running water. Together, these features are intended to make home pedicures more efficient and more comfortable than traditional foot files or pumice stones.

Benefits for home foot care

Electric callus removers can significantly reduce the time and physical effort needed to manage hard skin on the feet. Because the motor does the work, users with limited hand strength, arthritis, or reduced mobility may find them easier to use than manual rasps or stones. The even, continuous action of the roller also tends to give a smoother, more uniform finish, which many people find difficult to achieve with manual tools

For people who spend long hours standing, walking, or exercising, regular use of these devices can help prevent calluses from becoming excessively thick and painful. When combined with moisturizing creams, they often improve the look and feel of dry, cracked heels, which can increase comfort in shoes and confidence when wearing open footwear. Over time, home use may reduce the need for frequent salon pedicures, which can make electric callus removers a cost‑effective option for ongoing maintenance.

Safety and potential risks

When used properly on intact, healthy skin, electric callus removers are generally considered safe. Safety guidance usually emphasizes keeping the device moving and limiting contact to a few seconds at a time in any one area to avoid friction burns or removing too much skin. Many devices also include built‑in safety stops or pressure sensors that slow or stop the roller if the user presses too hard, helping to prevent injury.

However, misuse can damage the skin, especially if high speed and coarse rollers are applied for too long or on already fragile areas. Over‑filing may cause soreness, bleeding, or increased cracking, which can raise the risk of infection. These devices are not suitable for use over open wounds, blisters, infections, plantar warts, or inflamed skin, and people with diabetes, poor circulation, or neuropathy are often advised to seek professional guidance before using them.

Choosing a suitable device

Several factors influence how effective and comfortable an electric callus remover will be for an individual. Features commonly highlighted in reviews include the power of the motor, quality of the abrasive rollers, availability of different coarseness levels, and ease of cleaning. Powerful motors with stable speed tend to work better on thick calluses, while fine rollers and adjustable speeds are important for sensitive skin or regular light maintenance.

Waterproof or easy‑to‑rinse designs help maintain hygiene, since dead skin and debris can build up quickly on the rollers. Ergonomic shapes and non‑slip grips make it easier to control the device while reaching awkward areas around the heel and sides of the foot. Brand reputation, availability of replacement heads, and independent testing or consumer reviews are also useful indicators of reliability and performance.

Best practices for use

Effective and safe use of an electric callus remover follows a few simple steps. First, the feet should be clean and dry unless the device is specifically designed for wet use, as overly softened skin can be removed too quickly. The user typically starts with a lower speed and coarser head only if needed, gently gliding the device over callused areas for a few seconds at a time while checking progress frequently.

After filing, rinsing or wiping the feet and applying a moisturizer helps restore hydration and keep the newly smoothed skin supple. Cleaning the device according to the manufacturer’s instructions—such as removing the roller, rinsing it if allowed, and letting it dry—reduces the risk of bacterial buildup and prolongs the life of the tool. Moderation is important: using the remover once or twice a week for maintenance is usually sufficient, whereas daily or aggressive use increases the chance of irritation.

Limitations and when to seek help

Electric callus removers are designed for cosmetic, surface‑level hard skin and are not a substitute for medical assessment when calluses are painful, rapidly worsening, or associated with deformity or systemic illness. Deep cracks, bleeding fissures, or calluses caused by abnormal pressure from bone or joint problems may require professional podiatric care, orthotic support, or changes in footwear rather than repeated mechanical filing. People with diabetes or peripheral vascular disease, in particular, should discuss any home callus treatment with a healthcare professional due to higher risks from even minor foot injuries.

Used thoughtfully, electric callus removers can be a convenient, effective addition to home foot care, helping many users maintain smoother, more comfortable feet with minimal effort. Respecting safety guidance, pairing their use with good hydration of the skin, and recognizing when professional evaluation is needed allows these devices to be used to best advantage without unnecessary risk.

Durlacher’s corn is a distinctive, often very painful type of corn that typically occurs at the side of the nail of the little toe, especially where footwear places excessive pressure on this area. It occupies an interesting place in both the medical history of chiropody and in modern podiatric practice because it sits at the borderline between a traditional “corn” of skin and an abnormality of the toenail itself.

Historical background

The term “Durlacher’s corn” is derived from Lewis Durlacher, a prominent 19th‑century British chiropodist who served as chiropodist to the royal household and wrote an influential text on corns, bunions, nail disease, and foot care, first published in 1845. In his description, he highlighted a particularly painful corn close to the nail of the little toe that was long, thin, and difficult to see, especially in young people who had just begun to wear stiff, pointed shoes. Over time, this eponym became attached specifically to corns situated near the lateral edge of the fifth toenail, and in North America, the same lesion is often called Lister’s corn, reflecting regional differences in terminology rather than in pathology.

Typical site and appearance

Classically, a Durlacher’s corn forms at the outer side of the nail of the fifth toe, close to or apparently under the nail edge, in a location where shoe pressure is greatest. Clinically, patients describe a sharply localized, “deep” pain when pressure is applied, and the lesion often appears as a small but deep‑seated area of hyperkeratosis that may be mistaken for an ingrown toenail, a split nail, or a simple hard corn. Podiatrists frequently encounter corns on the fifth toes in general, but corns immediately adjacent to the nail base or margin—especially if recurrent and exquisitely tender—raise particular suspicion for a Durlacher‑type lesion.

Skin lesion or nail anomaly?

Historically, Durlacher described the lesion as a corn of skin—essentially a focused plug of thickened keratin in the epidermis, comparable to other corns produced by localized pressure and friction from footwear. However, more recent dermatologic and podiatric work has shown that a proportion of these so‑called Durlacher corns are in fact “double nails” of the fifth toe: miniature accessory nail plates on the lateral side, often separated from the main nail by a longitudinal groove or depression. Histological examination of tissue removed during surgery has demonstrated that in some cases the painful “corn” is composed of true nail keratin rather than skin keratin, and radiographs in selected patients have even shown a Y‑shaped distal phalanx that could help explain the formation of two nail segments.

Causes and contributing factors

Like other corns, Durlacher’s corns are closely linked to mechanical pressure and friction, particularly from ill‑fitting shoes that taper to a point or are too narrow across the toes. Stiff or pointed footwear pushes the little toe against the shoe upper, concentrating pressure at the outer nail edge and predisposing both to hyperkeratosis of adjacent skin and to chronic irritation of any underlying accessory nail segment. Foot structure and biomechanics also matter: a varus fifth toe, bony prominence, or abnormal nail shape can magnify focal pressure, so that even routine walking or sport gradually produces a painful Durlacher‑type lesion.

Symptoms and impact on function

Patients usually report a sharp, localized pain at the side of the fifth toenail that is aggravated by tight shoes, prolonged standing, or walking, and relieved by removing pressure. The pain can be severe enough to alter gait, leading to limping or compensatory loading of other parts of the foot, which in turn may produce secondary problems such as callus under the metatarsal heads or strain in adjacent joints. On examination, clinicians may see a small area of thickened skin, a tiny split or duplication of the nail, or both, and gentle probing often elicits disproportionate tenderness compared with the small visible lesion.

Diagnosis and differentiation

Diagnosis is largely clinical and begins with careful inspection of the fifth toe, ideally after reducing callus to reveal the underlying structure of the nail and surrounding skin. Dermatoscopy can help distinguish between pure hyperkeratotic skin (a true corn) and a divided or duplicated nail plate where a thin accessory segment lies laterally, explaining recurrent symptoms despite repeated debridement. The lesion must also be distinguished from an ingrown toenail, simple hard corn, or wart; unlike warts, corns and accessory nails lack thrombosed capillaries and maintain normal skin lines around them, and unlike a typical ingrown nail, the pain is often more pinpoint and associated with a tiny, deeply seated core or nail spicule rather than swollen, inflamed tissue

Conservative management

Initial treatment usually focuses on reducing pressure and friction while addressing the hyperkeratosis. Key conservative measures include careful podiatric debridement or enucleation of the corn, use of protective padding or silicone toe sleeves, and modification of footwear to provide more room in the toe box and reduce lateral pressure on the fifth toe. In patients with dry skin or associated callus, regular use of emollients and keratolytic creams (such as those containing urea or salicylic acid, when appropriate) can help soften thickened skin, though strong chemical treatments should be used cautiously and under professional guidance, especially in people with diabetes or circulatory problems.

Surgical and definitive options

When an underlying double nail or persistent, deeply seated corn continues to cause pain despite optimal conservative care, minor surgical procedures can provide more definitive relief. For double‑nail variants, a partial nail avulsion targeting only the small lateral nail segment has been described, often combined with chemical or surgical destruction of the accessory nail matrix to prevent regrowth while preserving the main nail. In cases where the lesion is primarily hyperkeratotic skin but driven by a bony deformity or extreme toe position, surgical correction of the underlying toe structure may be considered to redistribute pressure and prevent recurrence, though such interventions are reserved for selected, severely symptomatic patients.

Prevention and long‑term care

Prevention of Durlacher’s corns relies on the same principles used to prevent other corns and calluses: minimizing abnormal pressure, optimizing footwear, and monitoring high‑risk feet. Choosing shoes with adequate width, soft uppers, and sufficient depth in the toe box helps avoid compression of the little toe, while regular self‑inspection and early podiatric assessment of any tender area at the toenail margin can prevent a small lesion from becoming a chronic, disabling problem. For individuals with structural deformities, orthotic devices, toe spacers, or custom footwear may be recommended as part of a broader strategy to protect the lateral toes and maintain comfortable, efficient gait.

Significance in modern practice

Durlacher’s corn illustrates how a condition first described in an era of stiff, pointed boots remains relevant in contemporary practice, where fashion footwear and sporting shoes still create similar mechanical stresses. It also highlights the evolving understanding of foot pathology, moving from a purely skin‑based concept of corns toward recognition that in some cases a structural or nail‑based anomaly is the primary cause, with the corn merely a painful symptom of deeper anatomical variation. For clinicians and patients alike, appreciating this dual nature—part corn, part nail problem—guides more accurate diagnosis and more targeted treatment, improving comfort and function in a very small but disproportionately troublesome part of the foot.

Duct tape has garnered widespread attention as an unconventional remedy for plantar warts, but the evidence for its effectiveness is mixed and nuanced. This essay explores the history, application methods, proposed mechanisms of action, and the scientific literature—both supporting and opposing—regarding the use of duct tape for plantar warts. It also examines possible reasons for conflicting study outcomes and discusses recommendations for practical use within a broader context of plantar wart management.

Background and Rationale

Plantar warts are skin lesions caused by the human papillomavirus (HPV) and commonly occur on the soles of the feet, often leading to discomfort or pain when walking. Treatment options range from topical acids and cryotherapy to laser therapy, but these methods can be costly, painful, or associated with side effects. The use of duct tape as a cheap, accessible remedy stems from the principle of occlusion therapy, wherein the wart is covered to deprive it of air and possibly stimulate an immune response. Coverage with duct tape was first popularized in medical literature in the late twentieth century and has since become a household and internet sensation for wart sufferers seeking a do-it-yourself solution.

Application Methods

The most commonly cited duct tape regimen involves placing a piece of duct tape directly over the wart, leaving it in place for six days, then removing the tape, soaking the area in warm water, and gently abrading dead tissue with a pumice stone or emery board. After a night of letting the skin dry, a new piece of duct tape is applied, and the process is repeated for six to eight weeks or until the wart resolves. Variations exist—some recommend seven-day tape cycles, and there are anecdotal modifications, such as using banana peels alongside duct tape for added effect, although such approaches are less scientifically validated.

Mechanisms of Action

The exact mechanism by which duct tape could help eliminate warts remains unclear, but several theories have been posited:

• Physical occlusion supposedly starves the virus of oxygen, inhibiting its activity.
• Stripping and irritation from repeatedly removing tape might remove wart tissue layer by layer and provoke a local immune response.
• Chemical effects could arise from the adhesive or from the mild skin irritation induced by occlusion, further triggering immune activity.

Independent of which theory is correct, the clinical impact depends on whether the tape stays adequately adhered and if the skin is sufficiently irritated to stimulate immune clearance.

Scientific Evidence: Supportive Studies

One of the earliest prominent studies (Focht et al., 2002) compared duct tape with cryotherapy in 51 children and adolescents. The duct tape group had a remarkable 85% resolution rate versus 60% in the cryotherapy group, with the treatment often being painless and inexpensive. This favorable result sparked enthusiasm, as it suggested duct tape might outperform or at least equal some standard therapies.

Subsequent smaller studies examining variations like applying superglue (cyanoacrylate) prior to duct tape also found high clearance rates (up to 80%), suggesting that the essential component might be effective airtight occlusion, regardless of exact adhesive or tape composition.

Scientific Evidence: Contradictory Studies

Despite early optimism, later studies produced less encouraging results. For instance, a 2006 study in the Netherlands assigned children to either duct tape or placebo (corn pad) and found only 16% resolution after six weeks in the tape group, not statistically different from placebo.

In a blinded 2007 trial, adults treated with transparent duct tape fared no better than those using moleskin pads, with both groups resolving only about 20% of warts. Larger comparative trials involving adults also found that duct tape, while convenient, was markedly less effective than cryotherapy for complete resolution of plantar warts (20% for duct tape versus 58% for cryotherapy in one randomized study of 100 patients).

These mixed results highlight significant variability, which has prompted investigators to seek explanations for the inconsistencies.

Interpreting the Conflicting Findings

The most likely explanations for divergent study outcomes include:

• Adhesive discrepancies: Classic silver duct tape uses a rubber-based adhesive, whereas some trials used transparent tapes with weaker, acrylic-based adhesives. The degree of stickiness and skin occlusion could directly influence success rates.
• Patient demographics: Studies of children often show higher rates of spontaneous wart clearance versus adults, making it difficult to distinguish the therapy’s effect versus natural resolution.
• Methodology: Double-blind studies have proven difficult, particularly when visible duct tape is used. Placebo controls like moleskin or corn pads complicate direct comparison since they may have occlusive effects themselves.
• Compliance issues: Maintaining a tape seal—especially on soles of the feet—is challenging, and poor adherence reduces the efficacy of therapy.​

Current Clinical Recommendations

Most medical sources now view duct tape therapy as low-risk, inexpensive, and sometimes effective, but less reliable than professionally administered treatments like cryotherapy or topical acids. For patients averse to freezing or acid treatments, those seeking a painless and home-administered method, or those wishing to try “something before seeing a doctor,” duct tape appears reasonable, with the understanding that results are unpredictable and professional intervention may ultimately be required.

Benefits and Drawbacks

Benefits:

• Inexpensive and easily accessible
• Low risk of scarring or serious side effects
• Easily self-administered, appealing for non-invasive home care

Drawbacks:

• Requires prolonged, consistent application—typically 6-8 weeks—for a chance of success
• Possible skin irritation or contact
• May cause frustration or delay more definitive or faster

Best Practices for Use

• Use traditional silver or gray duct tape with rubber-based adhesive for best chances of efficacy.
• Ensure the tape fully covers the wart and remains intact as much as possible for six days at a time.
• Remove, soak, and gently abrade the area before reapplying fresh tape.
• Continue for 6-8 weeks, stopping if significant irritation or reaction occurs
• If the wart persists or grows, consider seeking professional treatment.

Duct tape therapy remains an intriguing, low-cost wart remedy that offers modest benefits for select patients and circumstances. While its effectiveness is not consistently supported by robust clinical evidence—especially in adults—its simplicity, safety, and accessibility ensure it endures as a popular home remedy. Ultimately, duct tape may succeed as an initial, non-invasive option, but those with persistent or painful plantar warts are likely better served by established medical treatments, particularly cryotherapy or topical agents. Future research focused on clarifying the mechanisms, adhesive factors, and best patient populations may yet refine the role of this classic “handyman’s tool” in dermatology.

Cimetidine, a well-known H2-receptor antagonist primarily indicated for gastric acid-related conditions, has attracted interest in dermatology for its potential as an oral immunomodulatory agent in the management of viral warts, including plantar warts. Despite its safety profile and theoretical immunological benefits, the clinical efficacy and evidence supporting cimetidine in this context remain debated. This essay explores the use of cimetidine for plantar warts, covering mechanisms, available evidence, clinical outcomes, controversies, and recommendations.

Mechanism of Action

Cimetidine modulates the immune response by inhibiting H2 receptors, which are present on T-suppressor cells. This inhibition is believed to enhance cell-mediated immunity by shifting the balance from Th2 (which favors humoral immunity) to Th1 dominance, thereby promoting the production of various cytokines such as interleukin-2 (IL-2), IL-12, tumor necrosis factor-alpha (TNF-α), and interferon-gamma (IFN-γ). The consequent activation of cytotoxic T-cells and natural killer cells is postulated to facilitate the clearance of human papillomavirus (HPV)-infected cells that cause warts, including those on the plantar surfaces of the feet.

Rationale for Use in Plantar Warts

Plantar warts, which often cause significant discomfort and resist common therapies, are caused by HPV, predominantly type 1. Traditional wart treatments, such as cryotherapy and topical salicylic acid, primarily target the lesion locally and can cause pain, tissue damage, and cosmetic concerns. Thus, a systemic, painless, and safe alternative such as cimetidine holds appeal, particularly for widespread, recalcitrant, or pediatric cases where topical treatments may be unsuitable.

Evidence from Clinical Studies

Open-Label and Observational Studies

Several studies have examined cimetidine’s efficacy in treating viral warts. An open-label study of 47 patients (including children and adults) with multiple, nongenital viral warts reported improvement rates of 64% in plantar wart cases and 75% for hand warts after three months of daily cimetidine therapy (30-40 mg/kg). Most patients who experienced complete clearance saw no recurrence if they continued treatment until all warts had resolved. The drug was well tolerated, and the majority of reported side effects were mild gastrointestinal disturbances, leading to discontinuation in only a small minority

A retrospective review of pediatric heart transplant recipients with recalcitrant warts reported complete resolution in all but one patient after five months of high-dose cimetidine (30-40 mg/kg/day), again demonstrating cimetidine’s potential role in difficult or immunocompromised patients.

Randomized and Placebo-Controlled Studies

However, randomized controlled trials offer a more nuanced perspective. Cure rates with cimetidine in several double-blind studies were not significantly superior to placebo. One study found a complete cure rate of 32% for cimetidine compared to 31% for placebo after three months, with confidence intervals overlapping and thus indicating no meaningful difference. Another trial found almost identical cure rates one month after treatment (77.6% for cimetidine versus 79.3% for placebo), and at two months (93.2% versus 94.6%). These findings highlight that the observed effects in open-label studies may be confounded by the natural history of warts, which can resolve spontaneously in about half of affected individuals over two years.

Safety Profile

One of cimetidine’s primary advantages is its safety profile. Adverse effects, when present, are usually mild gastrointestinal complaints such as diarrhea, nausea, or abdominal pain. Severe side effects are rare, and its use in pediatric patients is generally considered safe, with no major complications observed in the studies available.​

Current Guidelines and Recommendations

Given the inconsistent results in clinical trials and the relatively high spontaneous resolution rate of warts, most clinical guidelines do not recommend cimetidine as a first-line therapy for plantar warts. It may be considered, however, in special circumstances:

• Patients with multiple, recalcitrant, or disseminated warts, especially when topical or destructive treatments are not tolerated.
• Pediatric patients or those with immunosuppression (such as transplant recipients), despite the lack of robust efficacy data.

Limitations and Controversies

• The natural course of warts often includes spontaneous resolution, making it difficult to separate drug effect from normal immune-mediated clearance, especially in unblinded studies.
• Some studies show promising results in open-label or observational settings, but these are not confirmed in higher-quality placebo-controlled studies
• Those who discontinue cimetidine therapy before complete wart clearance may experience recurrence, though this may also reflect incomplete immune-mediated clearance.

Cimetidine, owing to its immunomodulatory properties and excellent safety profile, remains an option — though not a universally recommended one — for the systemic treatment of plantar warts, particularly when standard therapies fail or are inappropriate. The preponderance of current evidence suggests that while some individuals may benefit, especially in open-label trials, randomized controlled studies have not demonstrated a statistically significant benefit versus placebo. The choice to use cimetidine should be patient-centered, factoring in disease severity, comorbidities, previous treatment failures, and patient preference.

It is essential for clinicians and patients to maintain realistic expectations and understand that the natural history of warts and placebo effect are significant confounders in the available literature. A high-quality, well-powered randomized trial specifically focusing on plantar warts would be beneficial to resolve ongoing uncertainties.

COVID toes is a rare but recognized symptom associated with COVID-19 infection, characterized by swollen, discolored toes that often appear red, purple, or purplish-brown. This condition causes inflammation resembling chilblains, presenting as painful, itchy, or numb toes and sometimes fingers. While the exact cause of COVID toes remains uncertain, research points to it being an immune system response to the SARS-CoV-2 virus, potentially involving inflammation of small blood vessels in the extremities. COVID toes typically last one to two weeks and usually resolve without specific treatment, although in severe cases medical intervention may be necessary.

What Are COVID Toes?

COVID toes manifest as skin changes primarily on the toes but occasionally on the fingers, appearing as red or purplish discolorations, swelling, and sometimes blisters or raised bumps. The toes may feel painful, itchy, or numb, and the condition resembles chilblains — an inflammation of small blood vessels triggered by cold exposure but occurring here as a pseudo-chilblain phenomenon linked to COVID-19 infection. Such discoloration can appear as bright red initially then turn purple or purplish-brown, impacting both light and dark skin tones differently, with dark skin showing brownish-purple spots or swelling.

Causes and Mechanisms

The precise etiology of COVID toes is still debated in the medical community, but several contributing factors have been proposed:

• Immune Response: One leading hypothesis is that COVID toes occur as a result of the body’s immune response to the virus, where inflammation affects small blood vessels in the toes and feet, causing swelling and discoloration. This immune-mediated inflammation may be the body’s antiviral response.
• Vascular Effects: SARS-CoV-2 may directly or indirectly affect blood vessels, contributing to these cutaneous vascular changes seen as COVID toes.
• Similarity to Chilblains: The condition resembles chilblains, which typically arise from cold exposure causing painful inflammation in extremities. COVID toes represent a “chilblain-like” lesion but seemingly triggered without cold exposure.
• Underlying Health Conditions: Individuals with poorer circulation, such as in diabetes or peripheral artery disease, or those immobilized during hospital stays, may be more susceptible to developing COVID toes.

Symptoms and Duration

Typical symptoms of COVID toes include:

• Red or purple discoloration on one or more toes or sometimes fingers
• Swelling and sometimes puffiness of the affected digits
• Itchiness, burning sensation, pain, or numbness
• Raised bumps, patches of rough skin, or blisters in some cases
• Sometimes pus under the skin (rare)

Most people experience resolution of these symptoms within 1 to 2 weeks, although persistent or recurrent cases lasting months have been reported.

Diagnosis

Diagnosis largely depends on clinical examination and history of recent or concurrent COVID-19 infection. Though some patients may have tested negative for COVID-19, the diagnosis can be suspected based on characteristic appearance and timing during the pandemic waves.

Treatment and Management

There is no specific antiviral treatment for COVID toes since it is mostly a self-limited inflammatory response. Management focuses on symptomatic relief and monitoring for complications:

• Pain relief with over-the-counter medications like ibuprofen or acetaminophen
• Antihistamines for itching
• Topical corticosteroids (such as hydrocortisone cream) to reduce inflammation
• Elevating the foot and applying cold compresses to help reduce swelling
• Wearing loose, comfortable footwear to avoid further irritation
• In severe or persistent cases, medical consultation is recommended; some treatments like cilostazol have been reported to help by relaxing blood vessels.

If underlying conditions such as diabetes or peripheral artery disease are present, they should be managed appropriately to prevent worsening of symptoms.

Prognosis and Concerns

COVID toes are generally benign and not life-threatening, but they may signal an active immune reaction or potential vascular involvement. They can cause discomfort and impact quality of life temporarily. Importantly, the presence of COVID toes should prompt consideration of COVID-19 infection, even if respiratory symptoms are absent or mild. Patients experiencing unusual skin changes should seek medical advice to rule out other causes and receive appropriate care.

Summary

COVID toes describe a distinctive, chilblain-like skin condition affecting the toes (and sometimes fingers) linked to COVID-19 infection. It involves swelling, discoloration, and sometimes pain or itchiness, caused primarily by the body’s immune response to the virus leading to vascular inflammation. Mostly seen in children, teens, and young adults, the condition usually resolves on its own within a couple of weeks with supportive care. Awareness of COVID toes can aid in early recognition of COVID-19 cases and guide symptomatic treatment and supportive management.

This understanding is continuously evolving with ongoing research into the dermatologic and vascular effects of the SARS-CoV-2 virus.