An abscess on the arm can be treated according to the depth of the location of the abscess, as follows: 1. If the location of the abscess is deep, it needs to be actively treated by incision and drainage of the abscess. If the location of the abscess is superficial, you can use a sterile needle to pick the abscess and release the pus, and then carry out antibiotic treatment. Topical applications like erythromycin ointment or fusidic acid cream can be applied topically, which can prevent the inflammation from continuing to develop. Oral antibiotics are also needed, such as oral roxithromycin or oral cefadroxil, cefprozil, etc.; 3. If the pustules are small, such as pustular papules of follicular consistency, direct topical ointment can be applied, such as topical Longzhu ointment or topical ichthyolite ointment.