The bumps in the armpit may be due to bacterial infection resulting in folliculitis, or may be due to fungal infection resulting in ringworm, or may be due to local humidity and sweating resulting in eczema. 1. folliculitis: manifests as a follicular papule with pustules on the surface, usually painful, and can be treated with topical fusidic acid cream or Bactrim cream anti-infective treatment. 2. ringworm: is due to fungal infection, manifests as an erythematous surface with red papules, with heavy peripheral inflammation and light inflammation. It is caused by red papules on the erythematous surface, with heavy peripheral inflammation and light surrounding inflammation. If the exudation is obvious, first give boric acid solution to wet compress, and then give trimethoprim or pirenzone cream to topical application after the exudation improves.