Swollen cheeks in children may be related to atopic dermatitis, boils, papular urticaria and other causes. 1. Allergic dermatitis: If a child’s skin in the cheek area comes into contact with or ingests allergenic substances, causing the body to undergo an abnormal immune response, the cheeks become red and swollen. 2. Boils: If a single folliculitis is infected by germs, it can cause a localized inflammatory reaction, which can lead to redness and swelling of the cheeks. 3. Papular urticaria: If the child’s cheek area is bitten by mosquitoes, the substances in their saliva can cause the body to undergo abnormal immunity, and symptoms such as cheek redness, swelling and itching can occur. Parents are advised to take their children to the hospital in time to clarify the cause, and if treatment is needed, standardized treatment should be carried out under the guidance of the doctor.