Buttocks, i.e. buttocks, with many small bumps on the buttocks, may be a symptom of folliculitis, eczema or multiple lipodystrophy. You need to go to the hospital in time to get a clear diagnosis and use medication under the doctor’s guidance. 1. Folliculitis: the disease is caused by bacterial infection, which may be related to staying up late for a long time, eating spicy and irritating food or sitting for a long time. It is characterized by scattered inflammatory papules on the buttocks, with pus on the surface of the papules, accompanied by varying degrees of itching or pain. 2. Eczema: This disease is an inflammatory disease of the superficial dermis and epidermis caused by various reasons inside and outside, which may be related to heredity, immunity, allergy and so on. It can be manifested as large red spots and papules on the buttocks, accompanied by obvious itching. 3. Multiple lipodystrophy: the etiology is unknown, and it is hereditary in the family. It occurs in the chest, face, back, etc., and can also occur in the buttocks, appearing buttocks rubber hardness of subcutaneous nodules, the appearance of flesh-colored, from the central depression can be squeezed out of the oily sebum-like material. It is recommended that patients with a lot of small bumps on the buttocks go to a regular hospital in time, after a clear diagnosis and standardized treatment under the guidance of the doctor.