Pimples on the top of the buttocks may be caused by ringworm, folliculitis and other diseases. 1. ringworm: ringworm is caused by dermatophyte infection, can spread infection through direct contact, indirect contact and other ways, triggers include poor hygiene, sweating, etc., the patient’s buttocks may appear pimples, annular or semi-annular erythema, scales and so on. 2. Folliculitis: folliculitis is caused by bacterial infection, triggering factors include trauma, wearing tight clothes, etc. Due to the inflammatory reaction of the hair follicles and their surrounding tissues, the phenomenon of acne will appear, which may also be accompanied by itching, pain and other symptoms. There are many other causes of acne on the top of the buttocks, and it is recommended that patients go to the hospital in time to find out the cause of the disease and receive treatment as soon as possible.