Boil

n.
  1. A hard, painful, inflamed tumor, which, on suppuration, discharges pus, mixed with blood, and discloses a small fibrous mass of dead tissue, called the core.
    2. A blind boil ,
    one that suppurates imperfectly, or fails to come to a head.
    Delhi boil (Med.),
    a peculiar affection of the skin, probably parasitic in origin, prevailing in India (as among the British troops) and especially at Delhi.