Congenital dermal melanocytosis

Congenital dermal melanocytosis


Mongolian spots are flat, blue or blue-gray skin markings that commonly appear at birth or shortly thereafter.

See also: Rashes

Alternative Names

Mongolian spots; Congenital dermal melanocytosis; Dermal melanocytosis


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


Mongolian spots are non-cancerous skin markings and are not associated with disease. The markings may cover a large area of back.

Occasionally, Mongolian blue spots are mistaken for bruises, which can raise a question about possible child abuse

Symptoms include:

  • Blue or blue-gray spots on the back, buttocks, base of spine, shouders, and other body areas
  • Flat area with irregular shape and unclear edges
  • Normal skin texture

Exams and Tests

No tests is needed. Your doctor can diagnose this condition by looking at the skin.


No treatment is necessary or recommended.

Outlook (Prognosis)

The bluish discoloration often fades in a few years and is almost always gone by adolescence.

Possible Complications

There are no complications.

When to Contact a Medical Professional

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

Congenital dermal melanocytosis
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