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Hematology, also spelled haematology (from the Greek Î±á¼·Î¼Î±, haima blood and -Î»oÎ³Î¯Î±), is the branch of medicine concerned with the study, diagnosis, treatment, and prevention of diseases related to the blood. Hematology includes the study of etiology.
A hematoma or haematoma is a localized collection of blood outside the blood vessels, usually in liquid form within the tissue. An ecchymosis, commonly (although erroneously) called a bruise, is a hematoma of the skin larger than 10mm. It is not to be confused with hemangioma, which is an abnormal buildup of blood vessels in the skin or internal organs.