A normal mole is small (under pencil-eraser size), round or oval, one even color, smooth-bordered, and stable for years. Most adults have 10 to 40 of them.
Change is what earns a check, per the ABCDE rule: Asymmetry, ragged Border, multiple Colors, Diameter growing, or any Evolution, including new itching, bleeding, or crusting. The practical shortcut is the ugly-duckling rule: your moles resemble each other, so the one that looks different from the rest is the one to show a doctor. Moles appear anywhere, including sun-hidden skin, soles, and under nails. Habits that matter: a monthly self-check with a mirror or a partner for your back, annual skin checks for the fair, freckled, many-moled, or family-history crowd, and sun protection as the only prevention lever. A mole that changes, bleeds unprovoked, or is new and growing after 40 gets a dermatology visit within weeks: melanoma caught early is highly curable, which is exactly why the monthly look is worth doing.
What to do
Common questions
What does a normal mole look like?
Normal moles share a look, per MedlinePlus: small, usually under 6 mm (pencil-eraser size), round or oval, one even color (pink, tan, or brown), smooth and symmetric borders, flat or gently raised, and most importantly, stable: a mole that has looked the same for years is the reassuring kind. Most people have 10 to 40 moles, they mostly appear by age 40, and they often fade with age. The watch-for-change list (the ABCDE check): Asymmetry (one half unlike the other), Border (ragged, blurred, or notched edges), Color (multiple shades, or black, red, white, or blue areas), Diameter (growing past pencil-eraser size, though small melanomas exist), and Evolving (any change in size, shape, color, or feel, or new itching, bleeding, or crusting). The ugly-duckling rule is the practical shortcut dermatologists teach: your moles tend to resemble each other, so the mole that looks different from all your others is the one to show a doctor. Where they appear: anywhere, including sun-hidden skin, scalp, soles, and under nails. Practical habits: a monthly self-check in good light with a mirror (or a partner for your back), annual skin checks if you are fair, heavily freckled, have many moles, a family history of melanoma, or a big sunburn history, and sun protection as the only real mole-prevention lever. A mole that changes, bleeds without injury, or is new and growing after 40 gets a dermatology appointment within weeks, not months: melanoma caught early is highly curable, which is the whole point of looking.