Quick answer
A skin self-check means looking over your whole body, in good light, for any mole or spot that is new, changing, or different from the rest. Use the ABCDE rule as a guide, check the areas you can't easily see (scalp, back, soles), and note anything that changes over time. ScanSkinAI can support a self-check by helping you screen and monitor a spot from a phone photo — but it does not diagnose disease and does not replace a doctor or dermatologist. If a spot is changing, bleeding, or not healing, see a healthcare professional.
Key takeaways
TL;DR: Key Takeaways
- A skin self-check is a quick, head-to-toe look for moles or spots that are new, changing, or unusual.
- The ABCDE rule (Asymmetry, Border, Colour, Diameter, Evolving) is the simplest way to know what to look for.
- The most-missed areas are the scalp, back, backs of the legs, and soles of the feet.
- Change over time matters more than any single look — monitoring is the point.
- ScanSkinAI can help you screen and track a spot, but it is not a diagnosis.
- Any spot that is changing, bleeding, painful, or not healing should be reviewed by a professional.
Why check your skin at all?
Most skin changes are harmless. But skin cancer is one of the most common cancers worldwide, and the changes it causes usually appear on the surface — which makes the skin one of the few organs you can actually keep an eye on yourself. The earlier a concerning change is noticed and shown to a professional, the more options there tend to be.
A self-check isn't about diagnosing anything. It's about noticing — building a habit of familiarity with your own skin so that when something changes, you spot it.
How often should you check your skin?
A reasonable rhythm for most people is once a month, in line with general guidance from dermatology bodies such as the American Academy of Dermatology. Monthly is frequent enough to catch change, and spaced enough that you'll notice a difference from last time. If you have many moles, fair skin, a history of sunburn, or a family history of skin cancer, it's worth speaking to a doctor about whether you should check more often or have professional skin checks. For a deeper 15-minute routine, see our step-by-step skin self-exam guide.
How to do a skin self-check, step by step
You'll need a few minutes, a well-lit room, and a full-length mirror (a hand mirror and a phone camera help for the awkward spots).
- Face, neck and ears — including behind the ears and the hairline.
- Scalp — part the hair in sections, or use a phone camera or another person. This is the single most-missed area.
- Chest, torso and back — use the full-length mirror; for the back, a hand mirror or a phone photo works well.
- Arms, underarms, hands — don't skip between the fingers and under the nails.
- Legs, including the backs — sit down and check the fronts and backs, then the feet (soles and between the toes included).
- Note anything new or changed, and photograph it so you have a record to compare against next time.
What to look for: the ABCDE rule
The ABCDE rule, widely promoted by the Skin Cancer Foundation and dermatology bodies, is the simplest checklist for spotting a mole worth showing a professional:
- A — Asymmetry: one half doesn't match the other.
- B — Border: edges that are ragged, blurred, or irregular.
- C — Colour: more than one colour, or uneven shades of brown, black, red, white or blue.
- D — Diameter: larger than about 6mm (the size of a pencil eraser) — though smaller ones can matter too.
- E — Evolving: any change in size, shape, colour, or sensation, or a spot that bleeds, itches, or crusts.
The E is the most important. A spot that is changing is more telling than any single feature on its own. For visual examples of each, see our ABCDE rule guide with photos, and our melanoma vs benign mole comparison.
Worried about a specific spot?
Screen and monitor a mole or skin change from your phone — free to start, no download, no account required.
The habits that make a self-check actually work
Doing the look is only half of it. Four habits turn an occasional glance into something genuinely useful:
- Don't skip the spots you can't easily see. The scalp, back, and backs of the legs are common blind spots — a mirror, a phone camera, or another person can help.
- Watch for change over time. A single look tells you less than a series. The spots most worth monitoring are the ones that change — in size, shape, colour, or sensation.
- Trust the instinct that made you check. If something prompted you to look twice, that's worth acting on.
- Know when to seek professional advice. Self-checking is a prompt to seek care when needed — never a substitute for it.
How ScanSkinAI can help
ScanSkinAI is a browser-based skin health tool — no app to download, and no account needed to start. It's built around a simple Scan → Track → Review idea:
- Scan — take or upload a photo of a mole or spot, and the AI helps you screen it for visible features worth attention.
- Track — keep photos over time so you can see whether a spot is changing — the part of self-checking that's hardest to do by eye alone.
- Review — get clear guidance on when a change is worth raising with a professional.
It's designed to support a self-check — to help you notice and monitor — not to give a diagnosis. For high-intent checks, the Melanoma Checker and Skin Checker are the right starting points.
When should you see a doctor?
See a healthcare professional promptly if you notice any of the following:
- A mole or spot that is changing in size, shape, or colour.
- A sore that bleeds, or one that won't heal.
- A spot that is painful, itchy, or tender.
- A new growth that looks different from your other moles (the "ugly duckling").
- A spreading or blistering rash, or signs of infection (warmth, swelling, pus, fever).
- Anything that worries you — your concern is reason enough.
In the UK, you can start with your GP, who can refer you to a dermatology service if needed. See our country guides for next-step pathways: UK (NHS), Australia (Medicare), and New Zealand. For early signs of common skin cancers, also see our basal cell carcinoma guide and actinic keratosis guide.
What AI skin analysis cannot do
To use any AI skin tool safely, it helps to know its limits:
- It cannot diagnose skin cancer, melanoma, or any disease.
- It cannot replace a dermatologist, GP, dermoscopy, biopsy, or clinical examination.
- It cannot prescribe treatment.
- Image quality affects results — poor lighting or blur can change what the tool sees.
- It is a screening and monitoring aid. Worrying symptoms always warrant professional medical advice.
Frequently asked questions
Frequently Asked Questions
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.
Ready to check a spot you've been watching?
Use ScanSkinAI to screen and monitor a mole or skin change from your phone — free to start, in your browser, no download.