A hematoma, or haematoma, is an extravasation of blood outside the blood vessels, generally the result of hemorrhage. A Hematoma is a pocket or localised collection of blood usually in liquid form within the tissue. This distinguishes it from an ecchymosis, which is the spread of blood under the skin in a thin layer,commonly called a bruise. Internal bleeding is generally considered to be a spreading of blood within the abdomen or skull, not within muscle.Read more on Wikipedia
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