The red and itchy face after washing is mainly considered to be related to facial rosacea, hormone-dependent dermatitis, cold urticaria, eczema, seborrheic dermatitis and so on. 1. Rosacea: This disease is considered to be related to heredity, skin barrier damage, etc. Facial follicular worm infection will aggravate the condition, often manifested as facial redness, capillary dilatation, pimples, pustules, etc., and easy to produce red and itchy facial skin after washing the face and other stimuli. 2. Hormone-dependent dermatitis: patients who face long-term oral or facial long-term local application of glucocorticoid-containing ointments, may produce hormone-dependent dermatitis, often manifested as erythema, pimples, dryness, flaking, etc., so it is easy to trigger the face after washing the face with red and itchy symptoms. 3. Cold urticaria: usually after washing the face due to the stimulation of cold water, triggered by facial skin allergic reaction, the face appeared to the wind, swelling and so on, thus producing the symptoms of the face and itchy and red, allergic to the serious and even life-threatening. 4. Eczema: If there is a problem of eczema on the skin of the face, often manifested as facial erythema, pimples, papules, etc., after washing the face will induce the symptoms of red and itchy face. 5. Seborrheic dermatitis: associated with excessive sebum secretion, overgrowth of Malassezia bacteria causing an inflammatory response, impaired skin barrier function, immune response and individual susceptibility, in the local manifestation of obvious erythema, oily flaking and other symptoms, but also itching. It is recommended that patients with red and itchy face after washing go to the dermatology department in time for a clear diagnosis and standardized treatment under the guidance of the doctor.