The causes of acne on the back of the head include folliculitis, tinea capitis, herpes zoster, acne, etc. Treatment includes medication, physical therapy, surgery and other methods. 1. Folliculitis: commonly caused by bacterial infection of the hair follicles after triggering the inflammation of the hair follicles, at this time can be given to the compound polymyxin B ointment and other drugs anti-bacterial treatment. When the disease is more serious, you can take oral antibiotics such as amoxicillin capsules and other drugs. 2. Tinea capitis: If the scalp and hair are infected by fungi leading to the occurrence of tinea capitis, there will also be acne on the back of the head, at this time the need for antifungal treatment, such as external ketoconazole, miconazole ointment, oral itraconazole and other drugs. At the same time, pay attention to personal hygiene, the patient used clothing, bed sheets, covers, pillows should be thoroughly disinfected treatment. 3. Herpes zoster: If the chickenpox-herpes zoster virus infects the human body and triggers the phenomenon of pimples on the back of the head, at this time you can give acyclovir ointment, penciclovir cream antiviral treatment. At the same time, combined with oral antiviral drugs such as acyclovir, painkillers such as gabapentin, nutrients such as methylcobalamin, etc., together with physical therapy such as red light irradiation, the effect is better. 4. Acne: If it is acne, you can use topical retinoids such as adapalene gel, antibiotics such as fusidic acid, benzoyl peroxide, etc., and oral isotretinoin capsules and other drugs if necessary. If you have acne on the back of your head, please go to the hospital for examination, and the above medications should be used according to the doctor’s instructions.