Birthmarks and congenital skin lesions in Chinese newborns.

The presence of various types of birthmarks was determined in 3,345 Chinese infants under 48 hours of age. Mongolian spots were present in 86.3% of the studied infants. Vascular lesions included salmon patch (22.6%), port-wine stain (0.4%), and strawberry marks (0.7%). Nevocellular nevi (1%), sebaceous nevi (0.1%), and café au lait spots (0.4%) were also found. The following non-birthmark skin changes were observed: erythema toxicum neonatorum (33.7%), preauricular tags (1.3%), preauricular pits (2.5%) and a hyperpigmented scrotum (31.3%; in 1,727 male infants), which was related to the presence of mongolian spots.