ABCDE Rule for Melanoma: A Complete Guide to the Skin Self-Exam

Most people don’t look closely at their moles until something already looks obviously wrong. By then, you’ve lost the exact advantage that makes melanoma one of the most treatable cancers in the world: catching it early. When melanoma is found while it’s still confined to the top layer of skin, the five-year survival rate is around 99%. Once it’s spread to distant parts of the body, that number drops sharply. The difference between those two outcomes usually comes down to one thing: whether someone noticed a change early enough to act on it.The ABCDE rule is the tool dermatologists teach patients to make that noticing easier. It’s simple enough to run through in under a minute per mole, and it’s specific enough to catch the features that separate an ordinary mole from a dangerous one.What the ABCDE Rule Actually MeansA is for Asymmetry. Draw an imaginary line through the middle of a mole. On a normal mole, both halves should look roughly like mirror images of each other. On a melanoma, they usually don’t. One half might be a different shape, size, or thickness than the other.B is for Border. Healthy moles tend to have a smooth, even edge. Watch for borders that are ragged, notched,...