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Birthmarks are areas of skin that differ from the surrounding skin. Types include café au lait spot, congenital nevus and hemangioma. Not all birthmarks are present at birth — some develop weeks later.

Birthmarks are usually harmless and don't need treatment. Some fade with time. People may seek treatment for cosmetic reasons or because the birthmark is painful, large or fast growing. Some birthmarks may be a sign of an underlying disease.