Mongolian Blue Spots

Written by Ann Pietrangelo | Published on September 10, 2012
Medically Reviewed by George Krucik, MD

What Are Mongolian Blue Spots?

Mongolian blue spots, also known as slate gray nevus, are a type of pigmented birthmark. These marks are flat and blue-gray in color, and typically appear on the buttocks or lower back. They are generally present at birth or soon after. Mongolian blue spots are common in people with dark skin, particularly those of African, East Indian, or Asian descent.

These pigmented birthmarks are noncancerous and present no danger to your health. However, your pediatrician should examine the marks to confirm the diagnosis.

There is no recommended treatment for these birthmarks, and they often fade before the child reaches adolescence.

What Mongolian Blue Spots Look Like

Mongolian blue spots are birthmarks, but because of their color, they can be mistaken for bruises. The birthmarks are:

  • flat against the skin, with a normal skin texture
  • blue or blue-gray in color
  • usually between two and eight centimeters wide
  • of an irregular shape with unclear edges
  • usually present at birth or soon after
  • anywhere on the body, but usually located on the buttocks or lower back, and less commonly, on the arms or trunk

What Causes Mongolian Blue Spots?

The cause of these birthmarks is unknown. However, the color of pigmented birthmarks is determined by the amount of melanin (the substance responsible for skin color) you have. Therefore, you are more likely to have Mongolian blue spots if you have darker skin.

Are Mongolian Blue Spots Dangerous?

Mongolian blue spots are harmless. If your child appears to have Mongolian blue spots, make sure that your pediatrician examines the spots at your baby’s first checkup. A physician can diagnose Mongolian blue spots based on their appearance.

These spots are noncancerous and are not indicative of any disease or disorder. There is no need for medical intervention. In many cases, the spots fade over time and are gone by the time the child becomes a teenager.

Was this article helpful? Yes No

Thank you.

Your message has been sent.

We're sorry, an error occurred.

We are unable to collect your feedback at this time. However, your feedback is important to us. Please try again later.


Show Sources

Trending Now

Numbness, Muscle Pain and Other RA Symptoms
Numbness, Muscle Pain and Other RA Symptoms
The symptoms of RA are more than just joint pain and stiffness. Common symptoms include loss of feeling, muscle pain, and more. Learn more in this slideshow.
How to Evaluate Your Multiple Sclerosis Treatment Plan
How to Evaluate Your Multiple Sclerosis Treatment Plan
Every multiple sclerosis (MS) patient is different, and no single treatment plan works for everyone. Learn more about what to consider when evaluating your MS treatment plan.
Famous Athletes with Asthma
Famous Athletes with Asthma
Asthma shouldn’t be a barrier to staying active and fit. Learn about famous athletes who didn’t let asthma stop them from achieving their goals.
Understanding the Progression of Ankylosing Spondylitis
Understanding the Progression of Ankylosing Spondylitis
One serious potential cause of back pain is ankylosing spondylitis. Get an understanding of what this condition is, how it progresses, and potential complications in this slideshow.
The Best Multiple Sclerosis iPhone and Android Apps of the Year
The Best Multiple Sclerosis iPhone and Android Apps of the Year
These best multiple sclerosis apps provide helpful information and tools to keep track of your symptoms, including medication reminders.
Advertisement
Advertisement
Advertisement