A pool of blood outside the blood vessels.
A hematoma may be small, just under the skin's surface and look like a bad bruise. Or it may be large and deep inside the body. Hematomas can happen anywhere in the body, including the brain. An injury, such as from an accident or a surgery may cause a hematoma. Some hematomas are life-threatening.
Symptoms vary depending on the location of the hematoma. When the hematoma is in or just beneath the skin, symptoms may include a bruise with a lump, swelling, changes in skin color, and pain.
Treatment depends on the location, size and cause of the hematoma. Mild hematomas often go away on their own. Severe hematomas that happen after a major accident, such as a blow to the head, need emergency care. Sometimes surgery is needed.
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