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Bruises occur when capillaries and sometimes venules are damaged by trauma, allowing blood to seep into the surrounding extracellular space. Bruising, in medical terms, depends mostly on the size of the bruise. Generally, bruises are called hematomas, which when broken down literally means "blood tumor". If the hematoma is larger than 1 cm in diameter it is called an ecchymosis.
Other names for bruises are:
purpura (3-10 mm in diameter)
petechia (<3 mm in diameter)
Contusion or hematoma.

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13y ago

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