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Blister caused by a chemical burn

A blister is a small pocket of fluid in an upper layer of the skin caused by friction, burning or freezing. Most blisters are filled with a clear fluid called serum or plasma (blister water). Some blisters, however, are filled with blood; they are called blood blisters.

Blood blisters[change | change source]

A blood blister is a pocket of fluid filled with blood.