Congenital Dermal Melanosis
August 01, 2008
This fairly common phenomenon, also known as Mongolian spots, affects more than 90% of African Americans, 80% of Asians, 46% of Hispanics, and fewer than 10% of Caucasians.1 The bluish gray or slate-colored areas occur most frequently on the lower back and buttocks and less frequently on the posterior thighs, legs, back, and shoulders. The face is rarely affected. The skin coloration is believed to be caused by melanocyte migration arrest from the neural crest to the epidermis.