Red patches on the face and skin, may be related to eczema, solar dermatitis, psoriasis and other factors. 1. Eczema: this is a chronic itchy disease, patients may be due to abnormal immune function, contact with environmental food allergens, nervousness and anxiety and other factors, thus triggering or exacerbating the symptoms of eczema, facial erythema, edema, oozing, and then vesiculation will appear scabs and flaking, so the patient will be long red patches on the face with the symptom of peeling. 2. solar dermatitis: red patches on the face with the cause of the skin, but also does not exclude the possibility of solar dermatitis, mainly due to the skin to receive more than the amount of ultraviolet radiation, ultraviolet radiation will make the dermis release inflammatory mediators of a number of cells, resulting in vasodilatation, increased osmotic pressure, the face of the symptoms of long red patches of skin. 3. Psoriasis: the case of long red patches on the face and skin, do not rule out the possibility of psoriasis, also known as “psoriasis”, mainly due to genetic and immune factors, red patches appear on the skin, which is covered with silvery-white scales, accompanied by itchy, painful symptoms. There may be other reasons for the red patches of skin on the face, so patients should go to the dermatology department of a hospital for diagnosis and treatment by a professional physician.