The exact recovery of severe folliculitis on the back depends on the severity and there is no exact time reference range. Folliculitis is generally an inflammatory reaction of the hair follicles caused by a bacterial infection, and folliculitis on the chest and back can also be caused by the bacteria Malassezia. Severe folliculitis may result in redness and swelling of the skin, pus-filled discharge, or a large area of involvement. To treat severe folliculitis on the back, the skin should be kept clean and hygienic, and topical antibiotic ointment, such as fusidic acid cream and mupirocin ointment, should be used after routine disinfection with iodine, and topical ketoconazole and other antifungal medications should be used in Malassezia-induced folliculitis. If an abscess is formed and the pus is large and not easily drained, it can be surgically incised and drained. However, if the body has immunodeficiency, chronic diabetes, chronic tumors and other malignant diseases, it may not be easy to recover, the condition is recurrent, and you need to actively treat the primary disease. Severe folliculitis on the back should seek medical attention, and all medications should be used under medical supervision.