Long-term red rash bumps on the back may be caused by eczema, folliculitis, you need to go to the hospital in time, to clarify the cause of the disease, and actively carry out medication, physical therapy. Eczema on the back is often manifested as erythema on the basis of pinhead to grain-sized papules, papules, can be used externally with glycerine lotion, urea ointment, salicylic acid ointment, hydrocortisone cream, dexamethasone cream, halomethasone cream, and other medications for treatment. Or take oral medications such as loratadine, cetirizine, prednisone, and cyclosporine. Back hair follicle infection is often manifested as the formation of red pimples around the hair follicle, accompanied by red, swollen, hot, painful inflammatory reaction, need to be selected according to the type of infectious agent antibiotic or antifungal drugs such as treatment, including mupirocin ointment, amoxicillin, miconazole cream, fluconazole and so on. Ultra-short wave and far-infrared radiation can also be used to treat folliculitis on the back. All medications should be used under the guidance of a medical professional.