Kids Health Info

Mongolian blue spots

  • Mongolian blue spots are a type of birthmark. They are flat blue or blue/grey spots with an irregular shape that commonly appear at birth or soon after. They may also be called congenital dermal melanocytosis or dermal melanocytosis. 

    Mongolian blue spots are most common at the base of the spine, on the buttocks, and back. They also can appear as high as the shoulders or elsewhere on the body. They are common among darker skinned races, such as people of Asian, East Indian and African descent.


    Mongolian blue spots are not associated with any conditions or illnesses. Sometimes they can be mistaken for bruises. It is important to recognize that Mongolian blue spots are birthmarks, NOT bruises.


    • bluish to blue-grey spots
    • the coloration may resemble bruising
    • the coloured area feels the same as normal skin to the touch
    • commonly found at the base of the spine, on the buttocks, and back
    • may cover a large area of the back.


    No treatment is needed or recommended. There are no complications and the discolouration often fades in a few years and has usually gone once the child reaches adolescence.

    For more information

    • Talk to your family doctor, paediatrician or dermatologist.


    Produced by the Royal Children's Hospital (RCH) Dermatology Department. Many thanks to the parents who helped with this factsheet. First published March 2005. Updated November 2010.

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