Usually, the cause of acne on women’s backs can be folliculitis, acne and so on. 1. Folliculitis: When the skin is damaged or the hair follicles are stimulated by hairs, the skin barrier is damaged, resulting in easy invasion of bacteria into the skin, causing the occurrence of follicular inflammatory lesions, which start as red papules and gradually evolve into papular pustules, and the manifestation of pimples on the back will occur. 2. Acne: The occurrence of acne is closely related to excessive sebum secretion, follicular sebaceous gland duct blockage, bacterial infection and inflammatory reaction. The main lesions of acne are blackheads and whiteheads, and so on, will have the above symptoms. In addition, women with back acne are advised to go to the hospital in time and follow the doctor’s instructions to avoid delaying the condition. Patients should keep the skin dry and clean and avoid scratching the skin or squeezing the pustules to prevent infection.