Boils in the armpit are inflammatory diseases of deep hair follicles and sebaceous glands caused by bacterial infection. If the boil is only red, swollen and painful without pus can be applied topically with Longzhu ointment, fusidic acid ointment, or Bactrim ointment twice a day, or with oral anti-inflammatory drugs of antibiotic type. If the boil becomes pus, you can disinfect it and drain the pus with a fire needle, or draw the pus with a syringe, and after draining the pus, then apply several antibiotic-type ointments topically as described above for anti-inflammatory treatment. In the later stage, after the boil subsides, some of them will leave pigmentation spots, which can be treated with topical mucopolysaccharide polysulfate cream with vitamin E cream applied twice a day, which can promote the subsidence.