Blood blister

Common card · No. 328276

A blood blister is a type of blister that forms when subdermal tissues and blood vessels are damaged without piercing the skin. It consists of a pool of lymph, blood and other bodily fluids trapped beneath the skin. If punctured, it suppurates a dark fluid. Sometimes the fluids are cut off from the rest of the body and dry up, leaving behind dead cell material inside the blister with a texture like putty. Some blood blisters can be extremely painful due to bruising where the blister occurred. There are also blood blister-like aneurysms. These are sometimes located in the supraclinoid internal carotid artery, and have been recognized as having unique pathological and clinical features.

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