Mole Between Toes: Often Missed, Sometimes Concerning

Several factors combine to make between-toe spaces low-attention:

They are not visible without specifically lifting toes apart.

Warm and moist environment is associated with fungal infections, so any pigmentation often gets attributed to fungus.

People do not naturally examine these areas during routine activities.

Dermatologists may also examine these areas less thoroughly during routine exams unless prompted.

The result: lesions in between-toe spaces are often noticed only when they have become symptomatic, ulcerated, or large. Earlier detection requires explicit attention to this area during monthly self-exams.

Common harmless findings:

Benign nevi (moles). Same as elsewhere — flat or raised, brown, stable. Less common in this location than on more visible skin but possible.

Fungal pigmentation (tinea pedis). Brown, red, or dark patches associated with scaling, itching, or maceration. Usually resolves with antifungal treatment.

Post-inflammatory hyperpigmentation. After friction blisters, athlete's foot flares, or healed sores.

Friction patches. Darkening from chronic shoe pressure or athletic activity.

Maceration with discoloration. White or grey appearance from prolonged moisture, often with fungal infection. Usually reversible.

Distinguishing these from acral melanoma often requires dermatology examination — visual differences can be subtle, and the location complicates assessment.

Web-space acral melanoma is uncommon but described. It can present as:

A pigmented patch or streak in the web space between toes.

A pigmented nodule or raised lesion that doesn't resemble any benign condition.

A non-healing sore or ulcer mistaken for fungal maceration that doesn't respond to antifungals.

Multi-coloured pigmentation with irregular borders.

Key differentiators from fungal infection:

Fungal infections usually itch, smell, scale, or have white maceration.

Melanoma lesions are usually not itchy, don't have white maceration, and don't respond to antifungal treatments.

If a 'fungal infection' between toes has not responded to standard antifungal treatment in 4-8 weeks, biopsy is warranted to rule out melanoma. This is especially important if the affected web space looks pigmented in a different way from typical fungal patches.

Within 2-4 weeks if any:

New pigmented patch between toes in the past 6-12 months.

Growing or changing pigmented lesion in a web space.

Irregular borders, multiple colours.

'Fungal infection' that hasn't responded to antifungal treatment in 6-8 weeks.

Persistent web-space pigmentation that does not have associated fungal symptoms (no itch, no scale).

Within 1-2 weeks if any:

Non-healing ulcer or sore in a web space.

Bleeding or weeping lesion.

Distinct dark stripe extending from the web space onto a toe or sole.

Personal history of melanoma.

Monthly self-exam should include each web space:

Sit down. Lift each toe and look at the web space between it and the next toe. Use bright light (phone flashlight works).

Check both feet, all 8 web spaces (4 on each foot).

Look for any pigmentation that wasn't there before, any patch that has changed, or anything that looks unusual.

Dry the web spaces thoroughly after showering — long-term moisture promotes both fungal infection and makes pigmentation harder to assess.

Photograph anything notable with a coin or ruler for scale. Save with date.

For people in higher-risk groups (Asian, Black, Hispanic ancestry; prior melanoma; family history), 6-monthly dermatology checks of feet including web spaces are reasonable.

During routine podiatry visits (for nail care, ingrown toenails, etc.), ask the podiatrist to check between toes as well. They are well-positioned to notice unusual lesions.

If you suspect fungal infection between toes:

Use over-the-counter antifungal cream or powder for 2-4 weeks.

Keep the area dry — change socks frequently, dry thoroughly after showering.

Use breathable shoes; avoid prolonged closure of toes in damp footwear.

If no improvement in 4 weeks: see a GP or dermatologist. The lesion may be more resistant fungal, may be eczema, or may need biopsy to rule out melanoma.

If clear improvement in 2 weeks: continue treatment, expect resolution.

If worsening or new pigmentation appearing: stop self-treatment, see a dermatologist. Worsening despite treatment is a flag, not a reason for more aggressive antifungal use.

The rule: a 4-week trial of standard antifungal treatment is reasonable for suspected fungal infection. Persistence past 4-8 weeks calls for evaluation, not more antifungal.