Incidence of Mongolian spots and its common sites at two university hospitals in Tehran, Iran.

A total of 2,305 consecutive newborns at Shariati Hospital, Tehran, Iran, and 1,706 at Lolagar Hospital, Tehran, Iran, were examined for 2 years (2004-2006). Mongolian spots were found in 11.4% and 37.3% of newborns at Shariati and Lolagar hospitals, respectively. The most frequent site of involvement is the sacral, followed by the gluteal area.