Itchy face in summer when it is hot may be the cause of summer dermatitis and white heat rash. 1. Summer dermatitis is a seasonal skin disease that occurs only in the high temperature environment in summer, related to high temperature and warmth, mostly seen in high temperature workers, manifested as erythema of the skin, followed by the emergence of dense patches of pinhead-sized pimples accompanied by itching and mild burning sensation. 2. White prickly heat is caused by the retention of sweat in the skin due to the occlusion of sweat pores, which occurs in summer, manifesting itself as a dense arrangement of pinhead-sized pimples on the forehead, neck, trunk, etc., accompanied by itching and a burning sensation, which often subsides when the environment improves. If the symptoms of itchy face in the summer heat, you should go to the regular hospital in time to clarify the cause, the doctor according to the specific circumstances of the individualized treatment plan, so as not to delay the condition.