Medical Oncologist
Mole Self-Check Guide
The ABCDE Mole Check: — When Each Warning Sign Means See a Doctor
Learn what each ABCDE sign actually looks like on a mole, and whether it points you toward a routine check or care today.
- Five ABCDE signs — Asymmetry, Border, Colour, Diameter and Evolving
- One sign is enough — a single change can justify a doctor visit
- This week or today — bleeding, oozing or rapid change need same-day care
- No fixed numbers here — ask your own doctor for exact size and time cut-offs
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The ABCDE rule guides checking moles for Asymmetry, an irregular Border, uneven Colour, a growing Diameter and Evolving change over time. Any one sign can be enough to get a mole checked by a doctor, and multiple signs together, or a mole that looks different from your others, raise the urgency further.
Get medical help the same day if
- A mole starts bleeding, oozing or forming a sore that does not heal, without any injury.
- A mole changes noticeably within a short span of time — in shape, colour or size — not slowly over years.
- A new mole appears that looks nothing like any of your other moles, sometimes called the 'odd one out' sign.
- A mole becomes painful, itchy, tender or raised where it was flat and unnoticeable before.
- A family member or partner points out that a mole looks different from how it used to.
What do the five ABCDE letters actually check for?
- A – AsymmetryOne half of the mole does not match the other half in shape.
- B – BorderThe edges look blurred, notched or ragged instead of smooth and even.
- C – ColourThe mole shows more than one shade — brown, black, tan, red or white mixed together — instead of one even colour.
- D – DiameterThe mole looks noticeably larger than your other moles, not measured against a fixed size.
- E – EvolvingThe mole is changing in size, shape, colour or feel compared with how it looked before.
Which ABCDE finding means what, and how urgently?
| Sign | When to act |
|---|---|
| Asymmetry alone, present for years without change | Mention it at your next routine skin check |
| New border irregularity or blurring | Book a dermatology visit this week |
| Colour mixing that has appeared recently | Book a dermatology visit this week |
| Diameter clearly increasing over recent weeks | Book a dermatology visit this week |
| Evolving mole plus bleeding, oozing or a sore that will not heal | Get seen the same day |
| Two or more ABCDE signs together, or a mole unlike your others | Get seen the same day |
Common questions about the ABCDE check
1Does failing only one ABCDE sign mean it's skin cancer?
No. One sign alone does not confirm cancer, but it is reason enough to get the mole checked rather than wait. Doctors weigh how many signs are present together, how the mole compares with your other moles, and how it has changed, before deciding if a biopsy is needed.
2Can a normal, harmless mole show some ABCDE features?
Yes. Many ordinary moles are mildly asymmetric or have a slightly uneven border, especially moles present since childhood. What matters more is a mole that stands out from your other moles or is actively changing, not a single feature seen on its own.
3What if a mole doesn't fit neatly into any ABCDE letter?
The ABCDE rule does not catch every warning sign. Some skin cancers are small, evenly coloured or symmetric. If a mole simply feels wrong to you, or a family member says it looks different, get it checked even if it does not tick an ABCDE box.
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Common questions
The ABCDE Mole Check: Exact Thresholds for When to Worry — your questions answered
How often should I run the ABCDE check on my moles at home?
Run through the five ABCDE signs whenever you shower or dress, so a change is easy to notice against what you remember. There's no fixed schedule that suits everyone — ask your dermatologist how often to check, since it depends on your skin type, family history and how many moles you have. The main goal is comparing a mole with how it looked before, not just how it looks today. If you cannot recall how a mole looked last month, checking more often, or keeping a simple record, makes changes easier to spot early.
Should I take photos of my moles to track changes over time?
Yes, photos help, because memory is unreliable for small changes in shape or colour. Take a clear photo in good light next to something for scale, like a coin, and repeat the same angle each time you check. Keep photos organised by date so you can compare side by side rather than relying on how a mole 'seems' to have changed. Show your doctor the photos directly at your visit — a side-by-side comparison is often more convincing than a description, and it helps them judge how quickly evolving has occurred.
Does the ABCDE rule work the same way for moles on the scalp, soles or under nails?
Yes, the same five signs apply, but these sites are easy to miss and harder to compare with your other moles. A mole on the scalp needs a mirror or a family member's help to see; one under a nail may show as a dark streak rather than a round mole. Because sun exposure differs across your body, a mole in a rarely-seen spot deserves the same attention as one on your arm or face. If you cannot check these areas yourself, ask your doctor to include them at your regular skin check.
What happens at a dermatology visit for a mole that failed the ABCDE check?
The doctor will examine the mole closely, often with a handheld magnifying light called dermoscopy, and compare it with your other moles and, if you have them, earlier photos. If it still looks suspicious, they will usually remove all or part of it and send it to a lab for testing, a step called a biopsy. This is a short procedure done in the clinic. Most moles referred for an ABCDE concern turn out to be harmless, but a biopsy is the only way to know for certain, so do not skip the visit out of worry.
Can an injury or sun exposure make a mole look like it fails the ABCDE check without it being cancer?
Yes. A recent injury, an insect bite, irritation from clothing, or new sun exposure can temporarily change a mole's colour, size or border without it being cancer. This is exactly why the Evolving sign matters more when it happens on its own, over time, without an obvious cause. If you know what caused the change, mention this to your doctor, since it changes how urgently the mole needs review — but do not assume you're right and skip a check, especially if the mole does not settle back to normal.