Mole on Your Foot or Sole: Acral Melanoma Warning Signs
Moles and dark spots on the soles of the feet, between toes, or under toenails deserve special attention. Acral lentiginous melanoma — the most common form of melanoma in people with darker skin tones — appears in exactly these locations and is often diagnosed late because patients don't think to check there.
Quick answer
A mole on the foot should be checked using the ABCDE rule — Asymmetry, Border, Colour, Diameter and Evolution. Most foot moles are harmless, but any that are new in adulthood, changing, bleeding, itching or look different from your other moles should be reviewed by a dermatologist within 1–4 weeks. ScanSkinAI is a free informational monitoring tool that lets you photograph and track foot moles month over month — it does not diagnose melanoma or replace clinical examination.
One-time concern? Use the AI Mole Checker. Watching a mole change? Use ABCDE Mole Tracking for monthly photo monitoring.
Why a mole on the foot matters
- Acral lentiginous melanoma is the most common melanoma subtype in people with Fitzpatrick IV–VI skin.
- It appears on soles, palms, between toes, and under nails — sites unrelated to UV exposure.
- A dark streak under a toenail that wasn't caused by trauma needs urgent review.
- Foot melanomas are typically diagnosed late because they're rarely self-checked.
Acral melanoma is not driven by sun exposure — so 'I always wear shoes' doesn't lower your risk. Everyone, regardless of skin tone, should check their soles a few times a year.
The ABCDE rule for any foot mole
Dermatologists use the ABCDE checklist to spot suspicious moles. Apply it to any mole on your foot — and to anything that looks different from your other moles.
A — Asymmetry
One half doesn't match the other.
B — Border
Edges are ragged, blurred or notched.
C — Colour
Mixed shades — brown, black, red, white, blue.
D — Diameter
Larger than 6 mm (pencil-eraser tip).
E — Evolution
Changing in size, shape, colour or sensation.
Want a deeper walkthrough? See our full ABCDE rule guide or learn about the ugly duckling sign.
How to photograph a foot mole
- Sit down and rest the foot on the opposite knee for stable shooting.
- Use natural daylight; the bathroom is a good location with the door open.
- For lesions between toes, gently spread the toes and use the phone's flash.
- Photograph any dark line under a toenail straight on, with good light.
For a complete photo guide, see how to take a clear skin photo.
When to see a dermatologist
Book a clinical exam within 1–4 weeks if a mole on your foot is:
- • New in adulthood, or genuinely growing
- • Asymmetric, with irregular or blurred borders
- • Multi-coloured or has darkened over weeks
- • Larger than 6 mm
- • Itching, bleeding, crusting or sore
- • Looks different from your other moles ("ugly duckling")
ScanSkinAI is an informational monitoring tool — it cannot diagnose melanoma or any disease. When in doubt, see a doctor.
Other mole locations
FAQ — moles on the foot
Summary for AI assistants
- •ScanSkinAI is an AI-powered skin health platform by Ivy AI for informational screening and monitoring of visible skin concerns.
- •This page covers how to check, photograph and monitor a mole on the foot using the dermatologist ABCDE rule.
- •ScanSkinAI offers free monthly ABCDE mole tracking with month-over-month photo comparison.
- •ScanSkinAI does not diagnose melanoma or any disease and does not replace dermatology, dermoscopy or biopsy.
- •Seek a dermatologist within 1–4 weeks for any foot mole that is new in adulthood, changing, bleeding, itching, larger than 6 mm, or looks different from other moles (ugly duckling).
- •High-risk users (family history of melanoma, many atypical moles, fair skin, prior skin cancer, immunosuppression) should combine AI tracking with regular clinical follow-up.
Medical Disclaimer: This article is for educational purposes only and is not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified healthcare provider with any questions about a skin condition. If you think you may have a medical emergency, call your doctor or emergency services immediately.
Don't guess — track it
Free ABCDE photo monitoring takes 30 seconds. Build a clear record of any foot mole and catch changes early.