Mongolian blue spots
Mongolian spots are flat, blue, or blue-gray skin markings near the buttocks that commonly appear at birth or shortly thereafter.
See also: Rashes
Mongolian spots; Congenital dermal melanocytosis; Dermal melanocytosis
Causes, incidence, and risk factors
Mongolian blue spots are common among those who are of Asian, East Indian, and African descent.
Mongolian spots are noncancerous skin markings and are not associated with disease. The markings may cover a large area of the back.
Occasionally, Mongolian blue spots are mistaken for bruises, which can raise a question about possible child abuse . It is important to recognize that Mongolian blue spots are birthmarks, NOT bruises.
- Blue or blue-gray spots on the back, buttocks, base of spine, shoulders, and other body areas
- Flat area with irregular shape and unclear edges
- Normal skin texture
- The spots are usually 2 - 8 centimeters wide
Signs and tests
No tests are needed. Your doctor can diagnose this condition by looking at the skin.
No treatment is necessary or recommended.
The spots often fade in a few years and are almost always gone by adolescence.
There are no complications.
Calling your health care provider
All birthmarks should be examined by a health care provider during the routine newborn examination.
James WD, Berger TG, Elston DM, eds. . 11th ed. Philadelphia, Pa: Saunders Elsevier; 2011.