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Blood blister
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.〔http://cjns.metapress.com/content/e19bjkauj3abkng4/fulltext.pdf〕
== Causes ==
Blood blisters are commonly caused by accidents in which the skin is pinched by a tool, mechanism, or heavy weight without protective gear. Blood blisters can also arise from forcible human contact, including grappling.
Blood blisters also may occur with friction caused by constant rubbing of skin against a surface. Because of this, baseball pitchers and drummers often contract blood blisters on the fingers. They also form as a result of frostbite.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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