Mongolian Blue Spots: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Mongolian Blue Spots?
A pediatrician, a doctor for babies and children, usually notices Mongolian blue spots at newborn checkups. A dermatologist, a doctor for skin conditions, can help when there are questions about the spots. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What are Mongolian blue spots?
Mongolian blue spots are a kind of birthmark that is flat and blue or blue-gray in color. Doctors now call them dermal melanocytosis. They appear at birth or in the first few weeks of life.
The color comes from a collection of melanocytes in the deeper layers of the skin. Melanocytes are cells that make the pigment, or color, in the skin. A normal Mongolian blue spot is not cancer.
Symptoms
The spots are usually:
- Blue or blue-gray patches on the back, buttocks, base of the spine, shoulders, or other body areas.
- Flat, with an irregular shape and unclear edges.
- Normal in skin texture.
- 0.79 to 3.15 inches (2 to 8 centimeters) wide or larger.
The markings may cover a large area of the back. The spots are seen most often over the lumbosacral area, which is the lower back near the tailbone.
Unlike a bruise, a Mongolian blue spot is not tender and does not change color or change over time.
Spots that are normal birthmarks often fade in a few years. They are almost always gone by the teen years. Spots that are outside the lower back area, wider than 10 centimeters, dark in color, or many in number are more likely to last beyond one year.
Causes and who gets it
Dermal melanocytosis is common among people of Asian, Native American, Hispanic, East Indian, and African descent. One review reports that spots affect around 10% of White infants, 50% of Hispanic infants, and 90% to 100% of Asian and African infants.
How doctors diagnose it
No tests are needed. A health care provider can diagnose this condition by looking at the skin. If a provider suspects an underlying disorder, further tests will be done.
Dermal melanocytosis is sometimes mistaken for bruises. This can raise a question about possible child abuse. It is important to recognize that it is a birthmark, not bruises.
Spots on the back of the head, temple, jaw area, shoulders, or limbs can be confused with bruises from child abuse. That is why they should be documented at birth.
Treatment
No treatment is needed when dermal melanocytosis is a normal birthmark. If treatment is needed, lasers may be used.
Spots may be a sign of an underlying disorder. If so, treatment for that problem will likely be recommended.
When to see a doctor
All birthmarks should be examined by a provider during the routine newborn exam.
Mongolian spots can sometimes appear together with inherited metabolic disorders, which are conditions that affect how the body breaks down certain substances. Babies with extensive spots should be screened for these disorders. Ask your child's doctor about spots that cover a large area.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. A direct primary care doctor can check a birthmark, follow it over time, and refer you to a skin doctor or other specialist when needed.
Common questions
Are Mongolian blue spots dangerous?
Usually not. A normal Mongolian blue spot is a birthmark that is not cancerous. Sometimes spots are a sign of an underlying disorder, so a provider should check them.
Do Mongolian blue spots go away?
Often, yes. Spots that are normal birthmarks often fade in a few years. Some widespread, dark spots outside the lower back can last into adulthood.
Can Mongolian blue spots look like bruises?
Yes. Dermal melanocytosis is sometimes mistaken for bruises. A spot can be told apart from a bruise because it is not tender and does not change color over time.
Do Mongolian blue spots need treatment?
Usually not. No treatment is needed when dermal melanocytosis is a normal birthmark. If treatment is needed, lasers may be used.
Sources
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
