If you have a lot of red bumps on your buttocks with itching, on the one hand, it may be due to poor material of intimate clothing, repeatedly rubbing the skin of the buttocks caused by allergies, at this time it is recommended that patients pay attention to personal hygiene, change underwear and keep the area dry and clean. If the itchiness is more serious and the red bumps are larger in area, it is considered to be related to eczema, urticaria, insect bite dermatitis, folliculitis and other factors.1. Eczema: being in a dry, humid and stuffy environment for a long time will make the body secrete more sweat, and the buttocks are not easy to evaporate sweat due to sedentary, thus causing eczema. And some female patients use longer and thicker sanitary napkins during menstruation or do not change them in time, which may also cause local impermeability and cause eczema. It is recommended that patients frequently open windows to keep indoor air circulation and regulate temperature and humidity; 2. Urticaria: Delayed pressure urticaria usually occurs in sedentary patients, due to prolonged pressure on the buttocks is likely to cause a large red rash on the skin of the buttocks, which may be accompanied by itching symptoms, belonging to the physical factors that cause urticaria, which can subside on its own after a period of time, and the specific disease mechanism is not yet clear. Other types of urticaria may also appear on the buttocks, usually with a more rapid onset, and patients are advised to seek timely treatment; 3, insect bite rash: refers to mosquitoes, venomous insect bites due to venom stimulation caused by the body’s metabolic reaction resulting in a rash, the bite local rash, edema, blistering, itching and other symptoms. Ordinary mosquito bite rash may recover in about 7-10 days, but poisonous insect bites may cause inflammation, pus and other adverse effects, and patients are advised to seek medical attention in a timely manner. 4. Folliculitis: Due to improper cleaning of the patient’s buttocks, sweat, dirt and dander accumulate and cover the skin surface of the buttocks, which easily breeds bacteria causing inflammation of the hair follicles and the appearance of single or patchy red papules, which can be accompanied by itching and pain. If you have a lot of red bumps on your buttocks with itching, if you feel extremely uncomfortable, you should promptly seek medical examination and active treatment according to the examination results. Follow the doctor’s instructions to use topical ointments such as glyburide lotion, hydrocortisone ointment, dexamethasone ointment, or take oral loratadine, benadryl hydrochloride, chlorpheniramine maleate and other drugs to anti-allergic, anti-inflammatory and antipruritic.