The redness and itchiness of the skin allergies on the face are considered to be contact dermatitis, urticaria, eczema, etc. It is necessary to clarify the cause of the disease, and then choose the appropriate medication to address the cause of the disease, such as topical glucocorticosteroids, oral cetirizine, loratadine, etc., as well as physical therapy. 1. Contact dermatitis: Allergy to cosmetics and facial masks can cause contact dermatitis, resulting in redness and itching. If there is more exudation, 3% boric acid solution can be used as wet compresses; when there is no exudation, glucocorticoid treatment can be used, such as dianabed cream, hydrocortisone cream, etc.; combined with oral antihistamine treatment, such as loratadine, cetirizine and so on. 2. Urticaria: patients with urticaria may have symptoms such as edematous erythema, wind masses, and different sizes on the face. It can be treated with second-generation antihistamines, such as cetirizine and loratadine. 3. eczema: acute exudate more, can use 3% boric acid solution or 0.1% isacridine solution for wet compresses; no obvious exudate can be used externally with glucocorticoid drugs such as hydrocortisone butyrate ointment, etc., or calcium-modulated neural phosphatase inhibitors such as pimecrolimus, tacrolimus, etc.; chronic recalcitrant eczema, can be taken as physical therapy, such as ultraviolet light therapy, etc. treatment. It is recommended that patients go to the dermatology department of regular hospitals, after a clear diagnosis, follow the doctor’s instructions and reasonable use of medication, not blindly self-medication.