Itchy face on hot days is considered to be prickly heat, summer dermatitis, insect bite dermatitis and so on. 1. prickly heat: summer time weather is hot, sweating will be more, if the small sweat gland duct blockage will lead to sweat can not be normally discharged, will form prickly heat, common in infants and young children and the elderly, mainly manifested in the skin appeared on the small blisters, pimples and pimples, accompanied by tingling and itching symptoms. 2. Summer dermatitis: summer dermatitis is an inflammatory skin disease caused by hot weather, and high temperature, high humidity, and sweat and other stimuli have a relationship, mainly for symmetrical lesions, the beginning of the bright red patches, and then the appearance of corn size pimples, papules, accompanied by intense itching. 3. Insect bite dermatitis: mosquitoes are more common in summer, if the mosquito bite produces an allergic reaction, insect bite dermatitis will occur, there will be bright red air mass-like damage, accompanied by itching. Hot day face itch may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, follow the doctor’s instructions to give standardized treatment.