What is "delhi boil"

Aleppo boil \A*lep"po boil\, Aleppo button \A*lep"po button\, or Aleppo evil \A*lep"po evil\ . (Med.) A chronic skin affection terminating in an ulcer, most commonly of the face. It is endemic along the Mediterranean, and is probably due to a specific bacillus. Called also Aleppo ulcer, Biskara boil, Delhi boil, Oriental sore, etc.

Boil \Boil\, n. [Influenced by boil, v. See Beal, Bile.] 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.

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.