Redness and stinging in the cheeks can be a symptom caused by sun exposure, but it can also be a symptom of contact dermatitis, salpingitis and other diseases. Patients with redness and stinging of the cheeks should go to the hospital in time to find out the cause of the disease. 1. Sun exposure: When the cheeks are exposed to ultraviolet rays for a long time, it is easy to cause skin irritation, which leads to the symptoms of redness and stinging in the cheeks. 2. Contact dermatitis: contact dermatitis is an inflammatory skin disease triggered by skin contact with external substances, which may be related to skin contact with intolerant cosmetics, skin care products, and allergy-prone substances. Patients with contact dermatitis may experience redness and stinging of the cheeks. 3. Dengue: Dengue is a bacterial infectious skin disease caused by the invasion of hemolytic streptococcus bacteria into the skin, which may be related to the patient’s frequent picking and squeezing the skin and other factors. It can also lead to symptoms of redness and pain in the cheeks. Patients with reddened and stinging cheeks should go to the hospital in time and under the guidance of the doctor for regular treatment.