Itchy face in hot weather may be caused by sweat stimulation, eczema, corn rash and other factors. 1. Sweat stimulation: hot weather, the face will secrete a lot of sweat and oil, which will stimulate the facial skin, itchy feeling. 2. Eczema: the cause of the disease is not clear, mostly caused by internal (such as chronic infection lesions, blood circulation disorders, immune function abnormalities, etc.), external (such as sun exposure, heat, food factors, etc.) factors, resulting in patients with the face, ears, forearms and other exposed parts of the erythema, and the erythema on the size of a corn on the pimples or herpes, with a strong sense of itching. 3. Corn Rash: also known as prickly heat, when the weather is hot, sweat can not be discharged, so that the sweat ducts become narrow or blocked, resulting in patients with face, armpits, neck and other parts of the dense pimples, and surrounded by a red halo, accompanied by burning, itching sensation. In addition, the face itchy hot weather, may also be caused by other factors, it is recommended that patients go to the hospital in a timely manner to exclude physiological factors, follow the doctor’s instructions standardized treatment.