A Spot Between the Toes That Won't Heal

Does a spot between the toes that won't heal need to be checked?

Yes, once it has lingered beyond about three weeks. Most spots between the toes are athlete's foot, a wart, a callus, or irritation from tight shoes, and those come and go. A spot that never fully heals, keeps breaking down, bleeds, or is developing colour is behaving differently — and the feet are exactly where a slow-growing melanoma can pass for a stubborn sore. That combination is the reason to have it examined rather than treated blindly.

The trouble with feet is that no one watches them closely. A spot that heals then comes back on a hidden surface is easy to blame on shoes or a fungus for months. You cannot tell an early acral melanoma from a benign sore by looking at a photograph — they overlap. The useful response is to stop guessing, keep a dated record, and get a clinician to examine it.

A spot between the toes that has not healed in about a month should be examined, even if athlete's foot seems the obvious answer.

Why feet get missed — and why that matters

Feet sit at the far end of the body and the far end of attention. Between the toes, the soles, and the nails are hard to see and easy to assume are fine, so a spot there can go unwatched for a long time. This matters because acral melanoma — the kind that appears on these non-sun-exposed sites — is often found later than melanoma elsewhere, when it has had more time to grow.

It is also the melanoma that most affects people with darker skin. Skin cancer in skin of color is frequently overlooked precisely because it favours the soles, palms, and nails rather than sun-exposed skin, and because the assumption that darker skin does not get skin cancer runs deep. A thorough self-check that covers moles on the back should not stop at the ankles; the feet, including between the toes and under the nails, belong in it.

What a non-healing spot between the toes can be

Several ordinary things cause a spot between the toes, and they can look alike. The most common is athlete's foot (tinea), which brings peeling, cracking, itch, and moisture between the toes. Warts, corns and calluses from footwear, eczema, a splinter or foreign body, and a slow-healing blister all belong on the list too. These are far more frequent than cancer.

The reason a persistent one still gets examined is acral lentiginous melanoma, which grows on the soles, between the toes, under the nails, and on the palms. It does not always look like a dark mole. Some are brown or black — the classic black spot on the sole of the foot — but others are skin-coloured, pink, or show up as a non-healing ulcer or a spot that keeps bleeding. Because a fungal sore and an early melanoma can look the same, they are separated by examination and, when needed, a biopsy — not by matching a picture.

acral lentiginous melanoma — melanoma of the soles, palms, between the toes, and nails, unrelated to sun exposure and easily mistaken for a wart, callus, or fungal sore.

The ABCDEs and the extra signs that matter on the feet

For pigmented spots, dermatologists use the ABCDE signs — Asymmetry, Border irregularity, Colour that varies, Diameter larger than a pencil eraser, and Evolving over time — as clues that a mole or spot needs a closer look 1Ref 1Tsao H, Olazagasti JM, Cordoro KM, et al. (2015).Early detection of melanoma: reviewing the ABCDEs.The ABCDE criteria — Asymmetry, Border irregularity, Colour variegation, Diameter greater than 6 mm, and Evolving — are clinical features that support early detection of melanoma.. On the feet, two extra points matter: a spot does not have to be dark to count, and a sore that simply will not heal is itself a warning.

• Asymmetry — one half unlike the other.
• Border — ragged, notched, or blurred edges.
• Colour — more than one shade, or uneven brown, black, blue, or red.
• Diameter — larger than about a pencil eraser, though smaller spots still can matter.
• Evolving — changing in size, shape, colour, or height over weeks to months.

Beyond the ABCDEs, on the foot pay attention to a spot that will not heal, one that bleeds or ulcerates, new pigment, and a dark streak running from a toenail into the surrounding skin. Numbness in the toes usually points to nerves or circulation rather than a skin spot, so a non-healing lesion and numb toes are separate issues worth mentioning to a clinician. None of these signs is a diagnosis — together they set the urgency.

Photographing and tracking a spot on the foot

Because feet are hard to inspect, a photo record does real work here. Use a phone with good, even light, photograph the spot straight on and from an angle, and place a ruler or coin beside it for scale — a mirror or a second person helps for the sole and the webs between the toes. Repeat every week or two under the same conditions, and note the date and any change.

This turns a vague memory into a timeline that shows whether the spot is healing, holding, or evolving. It also supports a photograph-based visit: store-and-forward teledermatology triages lesions from submitted images and depends on clear close-ups meeting the AAD's image-quality standards 2Ref 2American Academy of Dermatology (2024).Teledermatology Standards.Store-and-forward teledermatology triages skin lesions from submitted images and relies on clear photographs meeting AAD image-quality standards.. For a spot tucked between the toes, careful positioning and lighting are what make those images useful.

How a foot spot is diagnosed and treated

Diagnosis starts with an examination, often using a dermatoscope, and if a spot is suspicious, a biopsy. For a possible melanoma, the sampling technique matters: a narrow, full-thickness excisional or saucerization biopsy is preferred over a superficial shave or partial punch, because it preserves the depth needed to stage the tumour accurately 3Ref 3American Family Physician (2011).Shave and Punch Biopsy for Skin Lesions.For a suspected melanoma, a narrow full-thickness excisional or saucerization biopsy is preferred over a superficial shave or partial punch to preserve staging accuracy.. The melanoma guideline sets the biopsy technique, the excision margins used once thickness is known, and when a sentinel lymph node biopsy is considered 4Ref 4Swetter SM, Tsao H, Bichakjian CK, et al. (2019).Guidelines of care for the management of primary cutaneous melanoma.The AAD melanoma guideline sets recommended biopsy techniques, surgical excision margins by tumour thickness, and the role of sentinel lymph node biopsy..

If a melanoma is confirmed, treatment depends on its stage. Early, thin melanomas are treated primarily by surgical removal, while more advanced disease may involve sentinel node evaluation, immunotherapy, or targeted therapy 5Ref 5National Cancer Institute (PDQ Adult Treatment Editorial Board) (2025).Melanoma Treatment (PDQ®)–Health Professional Version.Melanoma treatment depends on stage: early, thin tumours are treated primarily by surgical excision, while more advanced disease may involve sentinel lymph node biopsy, immunotherapy, or targeted therapy.. What this means in practice is simple: the whole plan hinges on the biopsy, and the biopsy hinges on getting the spot examined — which is why the first appointment is the important one.

For a suspected melanoma, how the biopsy is taken matters — a full-thickness sample preserves the depth used to stage it.

How soon to be seen for a spot that won't heal

A non-healing spot between the toes is not an emergency, but it should be seen within a few weeks rather than left for months. Melanoma found early and thin is far more treatable than melanoma found late, and on the feet late detection is the main problem — not because these cancers are especially fast, but because the spots are hidden. Earlier evaluation is the whole advantage.

If a dermatologist is booked out, a primary-care or podiatry clinician can examine the foot and refer, and a teledermatology photo can triage the wait. Cost should not be the barrier: a photograph-based visit is often the fastest, least expensive first look, and free community skin-screening events can flag a lesion for follow-up. However you get in, the goal is the same — a trained eye on the spot, and a biopsy if that eye is unsure.