Naevus

Naevus

Nevus (plural: nevi) is the medical term for a mole. Nevi are very common. Most peopleTrusted Source have between 10 and 40. Common nevi are harmless collections of colored cells. They typically appear as small brown, tan, or pink spots.

You can be born with moles or develop them later. Moles that you’re born with are known as congenital moles. However, most moles develop during childhood and adolescence. This is known as an acquired nevus. Moles can also develop later in life as a result of sun exposure.

There are many types of nevi. Some of them are harmless and others more serious. Read on to learn about the different types and how to know whether you should get one checked out by your doctor.