Definition of 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

Causes, incidence, and risk factors:

Mongolian blue spots are common among darker skinned persons, such as those who are of Asian, East Indian, and African descent.

Symptoms:

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.

Symptoms include:

• 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.

Treatment:

No treatment is necessary or recommended.

Expectations (prognosis):

The spots often fade in a few years and are almost always gone by adolescence.

Complications:

There are no complications.

Calling your health care provider:

All birthmarks should be examined by a health care provider during the routine newborn examination.