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Definition of Blood blister

Blood blister: 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 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.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=9541
Last Editorial Review: 9/20/2012

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