Dry and peeling skin on both sides of the mouth, consider seborrheic dermatitis is more likely, mainly due to vitamin deficiency, causing sebum secretion reduction caused by dermatitis. In terms of treatment, you can apply topical zinc oxide ointment, zinc oxide oil, vitamin E ointment, if accompanied by itching, you can take oral Orotadine hydrochloride tablets, citicoline capsules. At the same time facial skin care is very important, usually can apply Avène, or skin spring soothing and moisturizing medicinal cosmetics. And in clinical life, you should also avoid strong sunlight stimulation exposure, avoid drinking alcoholic beverages, avoid applying unknown, inaccurate composition of cosmetics, and need to avoid eating spicy, stimulating diet.