Pathology. a small elevation of the skin containing pus.
any pimplelike or blisterlike swelling or elevation.

1350–1400; Middle English < Latin pūstula, pūsula a pimple, blister; akin to Greek phȳsaléos inflated

pustuled, adjective
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World English Dictionary
pustule (ˈpʌstjuːl)
1.  a small inflamed elevated area of skin containing pus
2.  any small distinct spot resembling a pimple or blister
[C14: from Latin pustula a blister, variant of pūsula; compare Greek phusallis bladder, phusa bellows]

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Word Origin & History

late 14c., from O.Fr. pustule (13c.), from L. pustula "blister, pimple," from PIE *pu- "blow, swell," on notion of "inflated area" (cf. Skt. pupphusah "lung," Gk. physa "breath, blast, wind, bubble," Lith. puciu "to blow, swell," O.C.S. puchati "to blow").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pustule pus·tule (pŭs'chōōl, pŭs'tyōōl)

  1. A small inflamed skin swelling that is filled with pus; a pimple.

  2. A small swelling similar to a blister or pimple.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
pustule   (pŭs'chl)  Pronunciation Key 
A small inflamed swelling of the skin that is filled with pus.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
During the pustule stage, a fever is common and the pustules start to form into scabs.
Soybean rust lesion types and characteristics of early symptoms of soybean rust and bacterial pustule.
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