A blister is a small pocket of body fluid (lymph, serum, plasma, blood, or pus) within the upper layers of the skin, typically caused by forceful rubbing (friction), burning, freezing, chemical exposure or infection. Most blisters are filled with a clear fluid, either serum or plasma. However, blisters can be filled with blood (known as 'blood blisters') or with pus (for instance, if they become infected).
The word 'blister' entered English in the 14th century. It came from the Middle Dutch 'bluyster' ...
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