The most common cause of redness and itchiness on both sides of the cheeks is an allergic reaction, such as the occurrence of cosmetic dermatitis, food and drug allergies. In addition, it may also be caused by rosacea, dry skin, etc.: 1. Allergic reactions: such as allergic dermatitis, patients have red and itchy facial symptoms only after applying a certain cosmetic product, or after consuming food or drugs that are not normally eaten. There are also some patients in the exposed parts of the skin due to sun exposure can also cause dermatitis, called polymorphic sun rash. Oral anti-allergy medications, such as levocetirizine hydrochloride capsules and loratadine citrate tablets, etc., are needed under the guidance of a doctor, and topical medications to stop itching, such as tacrolimus ointment and mucopolysaccharide polysulfate cream, etc., can also be used. 2. Rosacea: The cause is still unclear, and is related to follicular worm infection, seborrhea, and vascular abnormalities. Among them, capillary-dilated rosacea, which is manifested as facial flushing or erythema, is often accompanied by dry, burning or stinging skin, and may also be accompanied by itching. Rosacea is generally treated by oral medication and topical skin care products that repair the skin barrier, while avoiding excessive cold and heat stimulation and mental tension, avoiding alcohol and spicy food, and avoiding prolonged sun exposure; 3. Suitable moisturizing and hydrating products can be.