When Is a Mole a Problem?

When Is a Mole a Problem?

A mole (nevus) is a benign growth on the skin. While very few moles become cancer, abnormal or atypical moles can develop into melanoma over time. "Normal" moles can appear flat or raised or may begin flat and become raised over time. The surface is typically smooth. Normal moles are round or oval and no larger than a pencil eraser. Most moles develop in youth or young adulthood. It's unusual to acquire a mole in the adult years.