A sun feel itchy skin may be the emergence of allergies or some other skin diseases (such as neurodermatitis, solar urticaria, etc.). 1. Ultraviolet allergy: when the sun a sun feel itchy skin, especially in the summer ultraviolet light is very strong when such a situation occurs, is likely to be the emergence of ultraviolet allergy, part of the people will also appear erythema, edema and so on; 2. Neurodermatitis: a part of the people due to neurodermatitis, there will also be itchy once the sun is exposed to the sun, at the same time, some other factors such as sudden changes in the climate, after eating some specific foods will also appear itchy skin; 3. solar urticaria: when suffering from solar urticaria, the sun not only itches the skin, but may also be accompanied by erythema, wind and other symptoms; The sun once the cause of itchy skin more, it is recommended to go to the regular hospital for a comprehensive examination, and targeted treatment.