Children’s lips red and swollen may be caused by angioneurotic edema, lipitis, mosquito bites, etc. It is recommended to consult a doctor in time and confirm after the doctor’s examination. 1. Angioneurotic edema: clinically, it is generally divided into hereditary angioedema and acquired angioedema, hereditary angioedema is mainly caused by gene mutation. Acquired angioedema is related to various factors, such as drugs, physical, disease, food and other factors. 2. Lip inflammation: due to contact with cosmetic drugs, local stimulation, spicy food, mental emotion, sunlight exposure and other factors, resulting in inflammatory reaction of the lips, lip cell tissue congestion, swelling, causing children’s lips red and swollen. 3. Mosquito bites: If children’s lips are inadvertently bitten by mosquitoes and insects, the local tissues of the external stimulus to produce a defense reaction, can lead to children’s lips red and swollen. If the phenomenon of children’s lips red and swollen, it is recommended to consult a doctor in a timely manner, with the help of a doctor to clarify the cause of the disease, and targeted treatment or treatment.