The collection of clotted blood outside of a blood vessel due to an injury to a blood vessel wall where blood seeps out into tissues where it doesn’t belong is referred to as a hematoma. The bleed could be very small with only a small amount of blood or it could be large and result in significant blood loss. A hematoma can occur due to damage to a capillary, artery, or vein.
Information. A hematoma can easily be confused with what is called a hemorrhage. A hematoma is best characterized by a bleed that’s already started to clot, where hemorrhage is best characterized as large scale active bleeding that has not yet begun to clot. The body activates blood clotting in order to repair the leaking vessel wall that has caused the hematoma. The clotting may not always be effective at repairing the leaking vessel if the individual has a clotting disorder or if the damage to the vessel is extensive and still actively bleeding. The location where the hematoma is within the body determines how it is described. Hematomas that occur on the skin are also described and termed based upon how large they are.