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A member asked:
Why do bruises turn black and blue?
A doctor has provided 1 answer
Localized bleeding: Bruises or hematomas are actually localized areas of bleeding from direct trauma to the involved area. The coloration is initially very dark (black and blue) but quickly fades to lighter shades as the body and local tissues metabolize and breakdown the millions of red cells that make up the bruise. Darker coloration correlates with a denser volume of bleeding.
Answered 3/6/2019
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