The common causes of itchy face after exercise and sweating are facial capillary dilatation, high salt content of sweat and allergic reactions. 1. Facial capillary dilatation: after exercise due to facial capillary dilatation, after contact with sweat and other dirt is more likely to produce itchy symptoms. 2. Sweat salt is too high: if the salt contained in the sweat is relatively high, the sweat stays on the face is easy to cause skin irritation, resulting in localized itching. 3. Allergic reaction: the face itchy after exercise may also be an allergic reaction to a substance in the sweat. Exercise sweat and face itch may also be other causes, if the symptoms are obvious, it is recommended to actively to the regular hospital, a clear diagnosis, follow the doctor’s instructions to deal with.