Abstract: The Mongolian spots in new borns of 359 cases and children aged 2-6 years of 465 cases in Huhht are reported. The results show that: ( 1) The incidence o f Mongolian spots in new borns of Mongolians is 82. 17% and 70. 43% for Hans. There is significant difference between the two natio nalities. ( 2) With age the Mongolian spots change as follows: the incidence o f the spots tends to reduce, the color of the spots becomes gradually lighter, the average number of spots increases slightly , the ratio of the spots involved area and their body surface area shows a tendency to reduce. ( 3) As regards the position of Mongolian spots in the newborns, the gluteal area is the site most frequently involved, followed by the sacrococcygeal area. In the children, the distribution of the spots is opposite to that in the new borns. ( 4) In the overwhelming majority of the cases, the spots involved area is less than 5% o f the their body surface area.

Key words: Mongolian spots, Mongol, Han ethnic group