The causes of itchy skin on the back include acne, mite infection, scabies, contact dermatitis, etc. Targeted medication should be taken according to the cause. 1. Acne: mostly due to acne bacillus infection, you can use fusidic acid cream, erythromycin ointment and other drugs for sterilization treatment, so as to alleviate the symptoms of itching. 2. Mite infection: for mite infection caused by itchy skin, you can use benzyl benzoate cream and other ointments to kill mites to relieve itching. 3. Scabies: For the itchy skin caused by scabies infection, 10% clomid emulsion can be used externally to kill scabies treatment to relieve itching. 4. Contact dermatitis: mostly caused by contact with certain irritating substances caused by skin allergic reactions, can be used topically in Dinaid cream, halomethasone cream and other drugs anti-inflammatory treatment to relieve itching. Itchy back skin may have other reasons, it is recommended to go to the hospital in a timely manner to clarify the cause of the disease, follow the doctor’s instructions standardized treatment.