pustule

Meanings

1. 1
   noun

   a small raised lesion on the skin containing pus

   The clinician examined the inflamed pustule for signs of infection.

2. 2
   noun

   a small blister, swelling, or pustule-like structure on a plant or animal

   The coral sting raised a watery pustule on her arm.

From Middle English and Old French pustule, from Latin pustula, 'blister or inflamed sore.' Medical use narrowed the primary sense to a small pus-containing skin lesion, while biology retains broader comparisons to blister-like structures.

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