Allergic itching of the back is mainly due to prolonged exposure to ultraviolet light, inappropriate medication, and allergic reactions that occur with inappropriate skin care. Therefore, in the case of mild itching with scattered erythematous papules, this can be treated by applying glyburide lotion, as well as compound camphor cream. If the itching is obvious and accompanied by a large number of red spots and papules, then you can take oral compound glycopyrrolate tablets and Epastine tablets, and at the same time, you can apply a mixture of tacrolimus ointment and mometasone furoate cream externally, generally mild patients, can be quickly relieved and cured. If severe itching occurs on the back, accompanied by a large amount of peeling, as well as erythema and papules, then you can take oral hydroxychloroquine sulfate tablets under the guidance of a dermatologist, as well as oral Angelica bitter ginseng capsules, and topical medications, you can apply urea vitamin E cream, and compound clobetasol propionate ointment for external use. During the treatment period, you need to avoid spicy and irritating food, alcohol, rest, and stay up less late, and you must pay attention to sun protection when you go out, use an umbrella or apply sunscreen or barrier cream.