Itchy face in hot weather may be caused by physiological factors, but also eczema, cholinergic urticaria and other pathological factors. 1. Physiological factors: the weather is too hot to evaporate the body’s moisture, resulting in the loss of facial skin moisture, facial skin dryness and thus cause symptoms of itchy face. In addition, when the weather is hot, sweating more, sweat stimulation of the skin on the face, will also cause the symptoms of itchy skin on the face. 2. Eczema: Eczema is caused by a variety of reasons for a superficial dermal and epidermal inflammation, patients often have localized skin itching, erythema and other symptoms, when the weather is hot, sweat stimulation is more likely to lead to itchy skin. 3. Cholinergic urticaria: cholinergic urticaria, mainly heat sensitivity, often in hot weather, the body appears in the wind like pimples, and accompanied by itching. Itchy face in hot weather may also be caused by other reasons, in the exclusion of physiological factors should be timely medical treatment, by the doctor to clarify the cause of the targeted treatment.