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Blister, blood: a blister full of blood due to a pinch, bruise or repeated friction.
A blister is medically termed a vesicle. One that is more than 5 mm in diameter with thin walls and is full of watery fluid is called a bulla.
The word blister entered English in the 14th century. It came from the Middle Dutch bluyster, blister and was a modification of the Old French blostre which meant a leprous nodule -- a rise in the skin due to leprosy.
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