Congenital melanocytic nevi often have variations in color and must be checked carefully for change. This image displays a congenital nevus with a black area, which should be evaluated by a dermatologist due to the possibility of melanoma. A congenital nevus on the sole or palm often has a flat appearance and may be brown to almost black in color. Moles (nevi) present at birth, made up of nests of pigment-producing cells, are known as congenital melanocytic nevi. A congenital nevus is often quite large and dark brown, as in this child’s armpit area. Congenital melanocytic nevi often have hairs present. This image displays a close-up of a small congenital melanocytic nevus. Congenital nevi can have raised areas, as seen here. A congenital nevus is found in about 2% of newborns and is usually a raised, brown spot, as seen here on the nose. A congenital melanocytic nevus (birthmark) usually has sharply defined edges and an even brown color. This image displays a close-up of a congenital nevus that is uniformly black. This image displays color and darker pigment typical of a congenital melanocytic nevus. Congenital melanocytic nevi are present at birth.
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Birthmark (Congenital Melanocytic Nevus)  A parent's guide for infants and babies

Picture of Birthmark (Congenital Melanocytic Nevus): Congenital melanocytic nevi often have variations in color and must be checked carefully for change. Divider line
Congenital melanocytic nevi often have variations in color and must be checked carefully for change.
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Signs and Symptoms
Congenital melanocytic nevi are brown or black, usually raised spots or patches, that are present at birth or shortly after (before 1 year). They are usually single but can be multiple and range in size greater than 1 cm to less than 20 cm (bathing suit or garment lesions cover large sections of the body). Smaller, so-called, satellite lesions are sometimes associated with large lesions.

The most common locations for these birthmarks are the buttocks, thighs, and trunk, but lesions may occur on the face and extremities, and, least commonly, on the palms, soles, and scalp.

Changes in thickness, color, and hair content occur through childhood and adolescence. In later adult years, they may actually fade in color to a lighter brown.
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Last Modified: 22 Dec 2008
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