The itchy buttocks with pimples may be caused by infection or allergy. It is recommended that patients go to the hospital in time to identify the causes of acne, and then for symptomatic treatment. 1, infection: more typical such as folliculitis, because the buttocks sebaceous glands are rich, and easy to sweat, especially some oily skin patients, oil secretion is more vigorous cause follicle pore blockage, resulting in secretions can not be discharged, bacterial infection, causing folliculitis. The patient with folliculitis can use antibiotic drugs or antifungal drugs for treatment under the guidance of a doctor, common medications are mupirocin ointment, cefuroxime, terbinafine, etc.; 2, allergy: butt itchy pimples may also be due to contact dermatitis caused by allergies. Because the buttocks is often in contact with inner clothing, toilet rings, etc., it is possible to come into contact with allergens, thus suffering from contact dermatitis. Contact dermatitis can cause itching and bumps on the skin. Patients with contact dermatitis should stay away from allergens after diagnosis. For milder symptoms, they can use glyburide lotion to wash the affected part. In terms of medication, patients can be treated with topical glucocorticoids, topical antibiotics, and oral antihistamines under the guidance of a doctor.