Causes itching on the back due to a variety of conditions, which can be primary itching or secondary itching due to suffering from other skin diseases. A. Primary itching is mainly pruritus, which can appear as scratch marks, blood scabs, accompanied by itching. Treatment can be oral Epinastine hydrochloride capsules, external application of furnace glycolic lotion 2 times/day, if itching is intense, you can also intramuscular injection of chlorpheniramine maleate injection 1 time/day, 1ml/time. Second, secondary itching can occur mainly in skin diseases such as psoriasis vulgaris. In terms of treatment to actively treat the primary disease, you can take oral anti-silver granules with compound amineptin tablets, and topical Denide ointment mixed with tacalcitol ointment to apply treatment, which can achieve anti-itch and anti-proliferative effectiveness.