It depends a lot on how big the hematoma is and what the cause is. The common name for a hematoma is a bruise - a collection of blood under the surface of the skin. In most individuals, bruises are not something to worry about. However in people who experience persistent unexplained bruising, large bruises or bruises which take a very long time to heal, it is worth seeing a doctor to check whether blood clotting function is normal.
In instances where you know you have done something which is going to cause a bruise, applying ice or a cold-pack to the area affected as soon as possible will reduce the amount of bruising which occurs.
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