“Itchy legs to be alert to the four diseases,” this statement is not appropriate, itchy legs are divided into physiological and pathological, pathological causes of skin diseases and allergic diseases. 1. Physiological: If the mosquito bites in summer, then it will produce localized itching of the legs; and dry weather in the north, if the number of baths will have more itchy legs. This is a normal physiological phenomenon, without additional special treatment. 2. Pathological: if eczema, dermatitis and pruritus and other skin diseases in the legs, the lesions will produce itchy legs; and urticaria and other allergic diseases will also appear itchy legs. If you suspect that itchy legs are pathological, it is recommended to go to the hospital for standardized diagnosis and treatment.