When an allergic reaction occurs on the face it is best not to eat xenobiotics, such as fish, shrimp, seafood, etc., to avoid aggravating the allergic reaction, and not to eat spicy, irritating foods to avoid redness of the rash and increased itching. It is also important to avoid excessive washing and hot and cold stimulation. If the skin lesions are red and swollen, you can apply cold compresses. It is recommended to use saline at about 4 degrees for wet compresses, and avoid violent hot and cold alternation, otherwise it will lead to the aggravation of allergy symptoms. It is best to eat a light diet during the allergy period. Some allergic reactions may induce gastrointestinal discomfort, so it is important to reduce the burden on the gastrointestinal tract, avoid eating foods with large oils and high protein, and it is best not to eat fruits that are not clear whether there is an allergic reaction, or synthetic foods containing food additives.