A mass of blood under the skin caused by a blow or by the effects of an operation.
A collection of blood forming a swelling. It may occur as the result of any injury or operation and is common on the head of newborn children after a long labour.
A haematoma is a localized collection of blood, often clotting, resulting from bleeding due to a ruptured blood vessel. These haematomas can develop in various areas of the body and range from minor to potentially life-threatening conditions.
Less severe forms of haematoma include those found under the nails or in the tissues of the outer ear, commonly known as “cauliflower ear.” Most haematomas tend to resolve on their own within a few days, but painful ones may require drainage. More severe types, such as extradural and subdural haematomas, exert pressure on the brain.