Buttocks are the buttocks, and buttock acne may be caused by diseases such as folliculitis, eczema, and perifollicular keratosis. 1. Folliculitis: usually an inflammatory disease caused by bacterial infection of the hair follicles and the tissues around the follicles. As the buttocks are sweaty, moist and airless, if you don’t pay attention to clean the local skin, it may lead to bacterial reproduction, and the tiny breakage after scratching makes the hair follicle and its surrounding tissues become infected, causing the phenomenon of buttocks acne. 2. Eczema: is caused by a variety of internal and external factors of the superficial dermis and epidermal inflammation, clinically acute lesions with herpes papules, tendency to ooze, the chronic phase of the moss-like changes, easy to recur, which can lead to buttock pimples. 3. Keratosis pilaris: the cause of keratosis pilaris is not yet clear, may be related to genetics, metabolic disorders, endocrine diseases. Follicular papules often appear on the outside of the upper arm, the outside of the thighs, buttocks and other parts of the body, and their tips are keratin plugs containing hair. It is recommended that patients with buttock acne go to the dermatology department of regular hospitals in a timely manner, after a clear diagnosis, standardized treatment under the guidance of the doctor.