Giant Congenital Nevi


Type of disease: Rare conditions

A congenital giant nevus is a dark-colored, often hairy patch of skin that is present at birth. It is usually smaller in infants and children, but continues to grow with the child. A giant pigmented nevus is usually larger than 20cm in diameter once it stops growing. They are often found on the buttocks, which is known as “bathing trunk” nevi. Skin cancer (such as malignant melanoma and other types) may develop in up to 15% (1 out of 6) of people with larger or giant nevi, often in childhood. The risk is higher for larger or giant congenital nevi located on the back or abdomen. Source: Genetic and Rare Diseases Information Center (GARD), supported by ORDR-NCATS and NHGRI.

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