Mongolian blue spot

Mongolian spots are flat, blue, or blue-gray skin markings near the buttocks that commonly appear at birth or shortly thereafter.
Mongolian blue spots are common among those who are of Asian, East Indian, and African descent.
Mongolian spots are not associated with disease. The markings may cover a large area of the back.

Occasionally, Mongolian blue spots are mistaken for bruises. It is important to recognize that Mongolian blue spots are birthmarks, NOT bruises.

Characteristic features are
    1.Blue or blue-gray spots on the back, buttocks, base of spine, shoulders, and other body areas
   2.Flat area with irregular shape and unclear edges
    3.Normal skin texture
    4.The spots are usually 2 - 8 centimeters wide.
No treatment is necessary or recommended.
The spots often fade in a few years and are almost always gone by adolescence.

Alternative Names
(Mongolian spots; Congenital dermal melanocytosis; Dermal melanocytosis)