Redness and peeling at the corners of the mouth can be considered to be related to diseases such as perioral dermatitis, stomatitis or ringworm. 1. Perioral dermatitis: an inflammatory dermatosis occurring on the upper lip, nasolabial folds, etc. The lesions can be seen as reddish papules or mounds of herpes with a red base or pustular herpes, accompanied by mild scaling and itching of the skin. 2. stomatitis: it can be caused by bacteria, fungi and other microbial infections, but also can be induced by nutritional element deficiency, reduced immune function and other factors, acute period of stomatitis area is congested, red and swollen, there can be bloody or purulent secretion exudation, chronic period of red and dry lips with cracks, there can be extensive peeling. 3. ringworm: when ringworm infection occurs in the corners of the mouth, there will be a gradual outward expansion of red ring-shaped red spots, accompanied by fine scales and mild inflammation, there may be papules or blisters. The corners of the mouth are red and peeling, inflammatory skin lesions, it is recommended to consult a doctor in a timely manner, and follow the doctor’s instructions to standardize the treatment.