A nevus is a benign growth of the skin. Most children develop nevi by their first birthday. The number of nevi increases with age, tapering off around the age of 15. Children with light skin who are prone to sunburn tend to have more nevi. Nevi occur more frequently on sun-exposed areas of the body.
Moles can be flat or raised.
They can be round or ovoid in shape, and are usually no wider than a pencil eraser. Most people have between 10 to 40 moles on their body. UV radiation can damage the skin and cause melanoma and other types of skin cancer. UV radiation that reaches the earth is made up of UVA and UVB rays. Avoid the midday sun as much as possible.