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Congenital Melanocytosis

Childhood Skin Problems

Medically Reviewed by Sabrina Felson, MD on June 22, 2021

Mongolian spots on baby's back

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SPL / Photo Researchers, Inc.

Congenital melanocytosis, previously known as Mongolian spots, is a very common condition in any part of the body of dark-skinned babies. The spots are flat, gray-blue in color (almost looking like a bruise), and can be small or large. They are caused by some pigment that didn't make it to the top layer when baby's skin was being formed. They are harmless and usually fade away by school age.

In most cases, no treatment is needed for the birthmarks themselves. When birthmarks do require treatment, however, that treatment varies based on the kind of birthmark and its related conditions. Read more about newborn's skin and rashes.

Slideshow: Slideshow: A Visual Guide to Birthmarks

Article: Your Newborn's Skin and Rashes
Article: Skin Conditions: Pigmented Birthmarks
Article: Cosmetic Procedures: Birthmarks and Other Abnormal Skin Pigmentation

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Image: SPL / Photo Researchers, Inc.

Text: "Your Newborn's Skin and Rashes", WebMD Medical Reference, "Skin Conditions: Pigmented Birthmarks", WebMD Medical Reference

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