The causes of itchy skin are more varied. First, if it is accompanied by erythematous clusters, this condition belongs to urticaria. Some of the urticaria will be aggravated at night, with itching and a variable number of erythematous clusters on the circumscribed skin. It may be accompanied by dyspnea, wheezing, diarrhea, abdominal pain, nausea, vomiting, and other symptoms. And it can also cause angioedema, such as the appearance of eyelids, lips, vulva and other swelling is obvious. Once it appears, you can choose desensitizing drugs for treatment, preferably cetirizine or loratadine for treatment, and then heavily, choose glucocorticoids for treatment and actively look for the cause. Second, if a rice-grain-sized papule appears on the thin and tender parts of the skin, such as the crevice of the hand, under the breast, small abdomen, under the armpit, forearm, etc., and the itching is obvious at night, and especially aggravated, this should be considered more likely to be scabies. It should be treated by ultraviolet radiation or external rubbing of sulfur ointment, and the clothes and bedding used should be ironed at high temperature and then dried under ultraviolet light, and these methods should be taken for treatment.