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.
Read more about Blood Blister: Prevention, Causes, Treatment
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“What the horrors of war are, no one can imagine. They are not wounds and blood and fever, spotted and low, or dysentery, chronic and acute, cold and heat and famine. They are intoxication, drunken brutality, demoralisation and disorder on the part of the inferior ... jealousies, meanness, indifference, selfish brutality on the part of the superior.”
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