A mole that is changing deserves a visit: the NHS lists change in size, shape, or color, pain or itching, inflammation, bleeding or crusting, or any new mark that has not gone away after a few weeks.
MedlinePlus's ABCDE checklist sharpens the eye: Asymmetry, irregular Border, multiple Colors, growing Diameter, and Evolving - change of any kind, the one doctors weight most. Most flagged moles are benign, but early melanoma is far easier to treat, so the system moves quickly when suspicion is real. Monthly self-checks (back, scalp, soles included) plus a photo for comparison turn guessing into measuring. Pymander is a free AI doctor, 24/7 by text, and can talk through what you are seeing.
What to do
Common questions
Should I see a doctor about a mole?
A mole that has looked the same for years is usually fine to leave alone. A mole that is changing is always worth a visit - and the NHS is blunt about what counts: a mole that has changed in size, shape, or color; one that is painful or itchy; one that is inflamed, bleeding, or crusty; or any new or unusual mark on your skin that has not gone away after a few weeks. MedlinePlus gives the memory aid dermatologists use, ABCDE: Asymmetry (one half unlike the other), Border (irregular, ragged edges), Color (more than one shade), Diameter (growing, typically past about 6mm), and Evolving (any change at all - the letter doctors weight most). None of these means cancer; most suspicious moles turn out benign. It means a trained eye should decide, because finding a melanoma early makes it far easier to treat, and the referral moves fast when it matters. Practical habit: check your skin monthly, including your back, scalp, and soles - use a mirror or a partner - and photograph anything you are watching so change is measured, not guessed. Pymander is a free AI doctor, 24/7 by text, that can help you think through whether a mole fits the check-it list.