The following are some of the possibilities for acne on the waist: 1. The appearance of clusters of blisters, or pimples, on the unilateral waist, and at the base, flushed patches of erythema, and accompanied by severe pain, is more likely to be considered herpes zoster, mainly due to viral infection. In terms of treatment, you can take oral vaxilovir hydrochloride pellets, and mecobalamin capsules, and topical acyclovir ointment for treatment. 2, the appearance of folliculitis papules, and pustular acne, mainly considering Propionibacterium acnes, bacterial infection is more likely to cause. In terms of treatment, topical clindamycin phosphate gel and compound polymyxin B ointment can be used for treatment. During the treatment period, you should avoid eating a spicy and stimulating diet, avoid drinking alcoholic beverages, keep your bowels open, and get good rest and sleep.