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What is a nevus?
Nevus (plural nevi ) is the medical term for a birthmark. Nevi are the most common abnormality of the skin, and apparently serve no function. If a birthmark is caused by pigment, it's called a pigmented or melanocytic nevus. If it is present at birth, it's called congenital. One in every 50-100 people is born with a small mole. Most people don't realize that moles can be so large as to be diagnosed medically as "giant nevi." Moles can cover a very large part of the body. Large nevi are found in every race, and strike genders equally. Nevus Outreach deals specifically with large congenital melanocytic nevi - big pigmented moles that are present at birth.
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