When the day is hot, the face will itch may be eczema, cholinergic urticaria and other diseases caused by different diseases, its cause is different. 1. Eczema: it is an inflammatory skin disease caused by a variety of internal and external factors, related to genetics, immunity, allergies, etc., can appear facial erythema, papules, papules, etc., accompanied by itching, the face can be itchy phenomenon when the weather is hot. 2. Cholinergic urticaria: mainly related to exercise, hot bath, eating hot food, etc., the face can appear in the heat of the day with different sizes of lumpy elevation, often accompanied by itching, can appear in the heat of the day facial itching symptoms. It is recommended that patients with facial itching during the heat of the day go to a regular hospital in a timely manner, after a clear diagnosis under the guidance of a doctor, pay attention to daily facial cleanliness, pay attention to sunscreen, and avoid over-cleaning the skin.