Webster's English Dictionary

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pustule

pus.tule \'p*s-(.)chu:(*)l, -(.)t(y)u:(*)l\ n [ME, fr. L pustula - more at 
   FOG] 1: a small circumscribed elevation of the skin containing pus and 
   having an  inflamed base 2: a small often distinctively colored elevation 
   or spot resembling a blist er or pimple