Red and white skin generally refers to the symptoms presented between normal skin and abnormal skin manifestations. It may be caused by eczema, contact dermatitis, urticaria, ringworm and other causes. 1. Eczema: Inflammatory reaction of the skin caused by internal and external stimulation of various factors may cause skin erythema, blisters, oozing, mossiness, itching and other symptoms, which may also lead to red and white skin. 2. Contact dermatitis: skin contact with external sensitizing or irritating substances cause skin sensitization or irritation reaction, may also cause skin erythema, causing red and white skin. 3. Urticaria: Temporary increase in vascular permeability of the skin mucosa, caused by limited edema can cause redness, doughnuts, swelling of the skin, can also cause red and white skin. 4. Ringworm: Fungal infection causing ringworm may cause ring-like erythema of the skin, which may also lead to red and white skin interspersed. There may be other reasons for the skin erythema, so you need to go to the hospital in time for examination and follow the doctor’s instructions for treatment.