Blister

small pocket of fluid within the upper layers of the skin
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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.

Blister caused by a chemical burn

Blood blisters

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