Blue-gray spots (Mongolian spots) appear as gray to blue colored, flat, "bruise-like" areas of skin. Blue-gray spots (Mongolian spots) typically occur on the trunk. Here, however, is a small area involving the hand. Blue-gray spots (Mongolian spots) can cover the entire buttocks, as in this newborn. Blue-gray spots (Mongolian spots) typically occur on the buttocks and trunk; rarely, they can occur on the legs and arms.
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Mongolian Spot (Blue-Gray Spot)  A parent's guide for infants and babies

Picture of Mongolian Spot (Blue-Gray Spot): Blue-gray spots (Mongolian spots) appear as gray to blue colored, flat, "bruise-like" areas of skin. Divider line
Blue-gray spots (Mongolian spots) appear as gray to blue colored, flat, "bruise-like" areas of skin.
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Overview
Blue-gray spots, commonly referred to as Mongolian spots, are large flat lesions that are usually found on the lower back or buttocks of infants at birth. They can occasionally be found on the legs or shoulders of infants, but this is less common. The color of blue-gray spots ranges from deep brown to slate gray or blue-black. They are caused by collections of pigment-producing cells (melanocytes) located in a deeper layer in the skin and are the most common type of birthmark.
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Last Modified: 2 Sep 2009
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