Picture of Congenital Nevomelanocytic Nevus
Congenital nevomelanocytic nevus; “split” of the eyelid. A sharply demarcated, brown plaque, involving the upper and lower eyelids in a 45-year-old Asian female. Nevomelanocytes migrate from the neural crest to the skin after the 10th week in utero but before 24 weeks when splitting of eyelids occurs.
Text: WebMD Medical Reference