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

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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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Treatments Your Physician May Prescribe
A skin biopsy may be done if there is suspicion of malignant change to the birthmark.

Small- to medium-size congenital melanocytic nevi (less than 20 cm, or about 8 inches) are often watched rather than removed surgically. In addition to observing the mole for any changes, photographs may be taken to document and follow potential changes in the mole.

Consultation and management by a dermatologist with further consultation to the plastic surgeon may be necessary. Removal may be desired for cosmetic reasons.

Ideally, giant congenital melanocytic nevi (greater than 20 cm) are removed surgically to reduce the risk of malignant change, although this is not always possible. If the moles are numerous or involve the head or spine, consultation with a neurologist may be suggested.

Last Modified: 29 Jan 2008

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