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pustule (n.)

"small, inflammatory sore or tumor containing pus," late 14c., from Old French pustule (13c.) and directly from Latin pustula "blister, pimple" (from PIE imitative root *pu- (1) "blow, swell," on notion of "inflated area;" source also of Sanskrit pupphusah "lung," Greek physa "breath, blast, wind, bubble," Lithuanian pučiu, pūsti "to blow, swell," Old Church Slavonic puchati "to blow"). Compare emphysema. Related: Pustulant; pustulate; pustulation.

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Definitions of pustule from WordNet

pustule (n.)
a small inflamed elevation of skin containing pus; a blister filled with pus;
From wordnet.princeton.edu