The appearance of plaque-like red spots on the face, accompanied by pronounced itching, is considered to be a possible facial dermatitis, related to allergic irritation, which includes allergy to oral food, as well as allergy to contact with certain skin care products and cosmetics. Irritant changes are mainly caused by contact with certain irritating substances, such as acidic liquids, alkaline liquids or certain drugs. After the liquid comes in contact with the stratum corneum of the skin, it will stimulate the structure of the stratum corneum surface and the stratum corneum defects trigger various symptoms. In addition, fungal infections on the face can also cause redness and itching, mainly due to the discomfort caused by fungus in the process of metabolism and decomposition of the skin stratum corneum, and it is necessary to go to the local hospital for a fungal test to find the fungus before a clear diagnosis can be made.