pustule

[puhs-chool]
noun
1.
Pathology. a small elevation of the skin containing pus.
2.
any pimplelike or blisterlike swelling or elevation.

Origin:
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)
 
n
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]
 
pustular
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

pustule
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)
n.

  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
The pathogen makes its presence known to humans through crimson pustules on the
  plant's stems and leaves.
When those pustules burst, millions of spores flare out in search of fresh
  hosts.
Secondary yeast infection is common, resulting in red color and surrounding red
  bumps or pustules.
Pustules form on the underside of the leaf, beneath the small spots.
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