bleb

Synonyms:

blister, bulla

Types:

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water blister

blister containing a nonpurulent clear watery content

blood blister

blister containing blood or bloody serum usually caused by an injury

pustule

a small inflamed elevation of skin containing pus; a blister filled with pus

pock

a pustule in an eruptive disease

Type of:

cyst, vesicle

a small anatomically normal sac or bladderlike structure (especially one containing fluid)