A congenital nevus is a birthmark that is a mole. Unlike other birthmarks, these moles don't usually disappear and may grow larger over time. Doctors consider these moles risky because they can become ...

Moles are common, small dark spots on the skin. According to the American Academy of Dermatology, adults have an average of 10 to 40 moles on their bodies. However, some people develop hundreds of ...