Itchy face in hot days may be related to salt irritation, heat urticaria, ultraviolet allergy, and so on. 1. Salt stimulation: the human body in the hot environment will sweat a lot, easy to precipitate salt on the skin, will destroy the skin keratin structure, but also stimulate the skin nerves itchy symptoms. 2. Thermal urticaria: When exposed to higher temperatures, allergic reactions are likely to occur, resulting in red patches with itching on the skin surface. 3. Ultraviolet allergy: may be more ultraviolet rays in the summer, sun exposure after the allergic reaction, can also be manifested in the face itching. Itchy face in the heat of the day can also be seen in other reasons, it is recommended to consult a doctor in a timely manner to clarify the cause, and follow the doctor’s instructions for targeted treatment or therapy.