A bruise is a common skin injury that results from the breakage of tiny blood vessels leaking under the skin. Blood from damaged blood vessels beneath the skin collects near the surface of the skin to appear as what we recognize as a black and blue mark. This mark is from skin discoloration by red blood cells and their contents. A bruise is also known as a contusion.
Medically Reviewed by a Doctor on 3/15/2014
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