Newborn skin: Part II. Birthmarks.

Birthmarks in newborns are common sources of parental concern. Although most treatment recommendations are based on expert opinion, limited evidence exists to guide management of these conditions. Large congenital melanocytic nevi require evaluation for removal, whereas smaller nevi may be observed for malignant changes. With few exceptions, benign birthmarks (e.g., dermal melanosis, hemangioma of infancy, port-wine stain, nevus simplex) do not require treatment; however, effective cosmetic laser treatments exist. Supernumerary nipples are common and benign; they are occasionally mistaken for congenital melanocytic nevi. High- and intermediate-risk skin markers of spinal dysraphism (e.g., dermal sinuses, tails, atypical dimples, multiple lesions of any type) require evaluation with magnetic resonance imaging or ultrasonography. Family physicians should be familiar with various birthmarks and comfortable discussing disease prevention and cosmetic strategies.