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 body 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 as these are known to be located in the supraclinoid internal carotid artery and "have been recognized as having unique pathological and clinical features.
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Famous quotes containing the word blood:
“Let us never accept the point of view that mysteries are written by hacks. The poorest of us shed our blood over every chapter. The best of us start from scratch with every new book.”
—Raymond Chandler (1888–1959)