Rash all over the back, may be due to folliculitis, eczema, contact dermatitis and other factors, the treatment includes general treatment and drug treatment. 1. Folliculitis: the phenomenon of red rash all over the back, may be due to Staphylococcus aureus or Malassezia infection caused by folliculitis, after diagnosis, you can cooperate with the doctor to choose iodophor solution for local disinfection, topical fusidic acid, mupirocin ointment and other antibiotics, or ketoconazole, clotrimazole ointment and other antifungal drugs. 2. Eczema: usually caused by a variety of factors stimulation, can cooperate with the doctor to choose glycerine lotion, can play the role of itching, and then topical dexamethasone, hydrocortisone and other glucocorticosteroid ointment, to achieve anti-inflammatory effect. Oral antihistamines such as loratadine can be combined. 3 contact dermatitis: for allergic people, may be in contact with allergens or irritants, thus appearing back rash symptoms, accompanied by itching, can be oral loratadine, cetirizine and other drugs to alleviate the symptoms, the topical zinc oxide ointment, hydrocortisone butyrate cream and so on. At the same time, you need to avoid the causative factors. There may be other reasons for the rash to grow all over the back, so if necessary, you need to cooperate with the doctor to improve the examination to determine the cause before treatment and therapy. The above medications should be used in accordance with the doctor’s instructions.