Buttocks, i.e. buttocks, bumps and itching may be due to contact dermatitis, eczema, folliculitis and fungal infections. 1. Contact dermatitis: the skin on the buttocks may have an allergic reaction after coming into contact with chemical fiber substances or metal objects, resulting in localized bumps and itching. 2. Eczema: related to a variety of factors such as the internal and external environment, pimple-like lesions may appear on the buttocks, accompanied by itching, oozing and other symptoms. 3. Folliculitis: due to clothing or sedentary reasons leading to humidity and airlessness of the buttocks, bacteria are easy to breed in this environment, which can lead to inflammation of the follicular opening and cause folliculitis. In the early stage of the disease, itchiness can occur, and in the later stage, redness, swelling and pain can occur. 4. Fungal infection: Itchy buttock bumps may also be due to fungal infection caused by ringworm. Buttocks long pimples and itchy, it is recommended to consult a doctor in time, clear cause after targeted treatment. Patients should pay attention to personal hygiene, keep the local skin clean and dry.