A lot of red bumps on the back can be caused by a variety of reasons, generally considered folliculitis, acne, eczema, hives, shingles and other causes, need to be taken by the physician according to the patient’s different causes of the appropriate treatment measures and methods. 1. Folliculitis: due to individual hair follicles being infected by bacteria, fungi and other pathogens, can be manifested as hair follicles with bumps accompanied by redness, swelling and pain and other symptoms. 2. Acne: due to excessive secretion of androgens, exuberant secretion of sebaceous glands, hyperkeratosis of hair follicles and other factors, can be manifested in the back of the chest, the face with pimples, red pimples, pustules and other symptoms. 3. Eczema: due to a variety of internal and external factors, it can be manifested as red spots, papules, blisters, oozing on the back, accompanied by itching. 4. Urticaria: due to infection, food and drug allergies, etc., it can be manifested as edematous erythema on the back or the whole body with itching. 5. Herpes zoster: due to varicella zoster virus infection, usually along the intercostal nerve distribution of red papules, papules, pain and other symptoms. The back grows a lot of red bumps need to go to the hospital, diagnose the cause of the disease after targeted treatment.