The causes of redness, heat and itching of the patient’s face are more common, mostly due to allergies, elevated body temperature and bacterial infections. If the patient is unable to judge or if such symptoms persist for a longer period of time, in order to avoid further aggravation of the condition, the patient can seek medical treatment in a timely manner. Patients with sensitive skin use skin care products and cosmetics containing allergenic substances, thus destroying their skin barrier and causing thinning of the stratum corneum, etc. can occur facial allergic reactions. This can be manifested as redness and heat on the face, accompanied by itching. In addition, a small number of patients with allergic diseases, such as contact dermatitis, eczema, urticaria, etc., if the affected area is the face can also appear similar symptoms; 2, body temperature rise: due to alcohol, emotional excitement, rising environmental temperature and high fever caused by different diseases can cause the patient’s body temperature to rise, causing the expansion of blood vessels throughout the body to dissipate heat, and the facial skin is thin, so the degree of expansion is more obvious. Therefore, redness, fever, accompanied by itching can occur; 3, bacterial infection: facial bacterial infection is mostly seen in Staphylococcus aureus, streptococcal infection, manifested as facial redness, fever, swelling, pain, etc., accompanied by itching.