Itchy face after sweating may be caused by physiological factors, but also may be caused by eczema, seborrheic dermatitis and other diseases. 1. Physiological factors: the environment is too hot will lead to sweating, sweat stimulation of the skin on the face, can also cause the face itchy. 2. Eczema: eczema may be genetic, immune abnormalities and other factors, the patient may appear excessive sweating, accompanied by local skin itching, erythema and other symptoms, eczema symptoms can be aggravated after sweating, or due to sweat stimulation of inflammation of the skin, resulting in itchy skin. 3. Seborrheic dermatitis: seborrheic dermatitis is associated with exuberant sebum secretion, impaired skin barrier function, immune response and individual susceptibility to infection, symptoms include itching, pimples, flaking, etc. Sweat stimulates the inflammation of the skin, which can lead to itching. Excluding physiological factors, after sweating face itchy may have other reasons, it is recommended that when discomfort occurs, you should promptly seek medical attention to identify the cause, and then on the cause of the treatment.