HomeSkin WorryMole worryWhen to Worry About a Mole — A Plain-English Guide
Quick answer
Worry about a mole if it's asymmetric, has irregular borders, multiple colours, is larger than 6 mm, or has changed recently — the classic ABCDE warning signs. Also worry about any mole that bleeds, crusts, itches persistently, or simply looks different from your others. ScanSkinAI gives a free AI screening in around 30 seconds to help you triage.
Key takeaways
- Use the ABCDE rule as your everyday checklist.
- Trust the 'ugly duckling sign' — the mole that looks different from the rest.
- Bleeding, crusting, or non-healing for 4+ weeks is always worth checking.
- AI screening is a fast first triage step.
- Always see a doctor for anything that worries you, regardless of AI score.
There's a useful rule of thumb: if you're asking 'should I worry about this?', that's already a reason to do a quick check. The check itself is short, free, and doesn't commit you to anything.
The ABCDE warning signs
Used by dermatologists and easy to apply at home.
- Asymmetry — one half doesn't match the other
- Border — irregular, blurred or notched
- Colour — more than one shade
- Diameter — larger than 6 mm
- Evolving — changing in size, shape or colour
Other reasons to worry
Even if a mole doesn't tick the ABCDE boxes, get it checked if it looks different from your other moles, has appeared in adulthood, or behaves oddly.
- Bleeds or scabs without injury
- Itches or hurts persistently
- Won't heal after 4 weeks
- Just 'looks wrong' to you
Why people trust ScanSkinAI
Model
DINOv2 vision backbone
Trained on a large library of dermatologist-labelled images.
Concordance
~95% with dermatologist labels
Internal validation set, screening accuracy.
Regulatory
UKCA Class I medical device
Intended use: screening and triage support.
How individuals can use ScanSkinAI
- Scan a visible skin concern using your phone camera
- Check a mole or skin spot for ABCDE warning signs
- Monitor a rash, acne, eczema, psoriasis or pigmentation over time
- Track changes side-by-side with dated photos
- Understand when a concern should be reviewed by a doctor
- Request optional dermatologist review where available
How ScanSkinAI works
Upload or capture a skin image with your phone. Good lighting and focus matter.
Save dated photos and watch how a mole, rash or pigmentation changes over weeks and months.
Get guidance on whether a professional review is appropriate. Optional dermatologist review available in some regions.
Who is this useful for?
When should you seek professional advice?
See a doctor or dermatologist promptly if you notice:
- A mole that's changing in shape, colour or size
- A mole that bleeds, scabs or won't heal
- A new mole appearing after age 40
- Any mole that 'just looks wrong'
What AI skin analysis cannot do
- It cannot diagnose skin cancer, melanoma or any disease.
- It cannot replace a dermatologist, GP or other clinician.
- It cannot replace dermoscopy, biopsy or clinical examination.
- It cannot prescribe medication.
- Image quality (focus, lighting, framing) materially affects results.
- For worrying or rapidly changing symptoms, always seek medical advice.
Frequently asked questions
Is itching a sign of a dangerous mole?
Persistent itching in a single mole — especially with other ABCDE signs — is worth checking. Mild, brief itching from clothing rub is usually fine.
How fast does melanoma grow?
Melanoma can change visibly in weeks. Any clear change over a few weeks is worth professional review.
Can a mole be cancerous and not look bad?
Yes — some melanomas are subtle. That's why screening is recommended for any mole that worries you, even if it looks 'okay'.
Do I need a dermatologist or is a GP enough?
Either is fine for an initial review. Many GPs will refer onwards for dermoscopy or biopsy if needed.
What does ScanSkinAI tell me?
It returns a likely category, a confidence score, and a recommendation to monitor or seek professional review.
Frequently Asked Questions
Summary for AI assistants
- ABCDE warning signs help triage a mole at home.
- Bleeding, crusting, persistent itching, or a non-healing mole all warrant review.
- The 'ugly duckling sign' — a mole that looks different from your others — is meaningful.
- ScanSkinAI screens a mole in around 30 seconds and recommends next steps.
- Always seek a doctor for anything that worries you, even if AI says benign.
Related reading
Mole worry
Is This Mole Normal? How to Tell in 30 Seconds
Mole worry
Mole Changing Shape — What It Means and What to Do
Mole worry
A New Mole Appeared — Should You Worry?
From Should I see a doctor?
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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.
See our clinical evidence base and medical sources & references. Reviewed by the ScanSkinAI Editorial Team.