The red circle under the skin of children’s mouth may be like licking lips, food allergies and saliva rash and other causes, you can choose to improve the bad habits, take anti-allergy drugs or use moisturizing cream and other ways to alleviate the treatment. 1. Like to lick lips: children have the habit of licking lips, long-term licking lips will cause the symptoms of red circles under the skin of the mouth, parents are advised to supervise children to develop good habits. 2. Food allergy: children consume their own allergic food or contact with allergic substances, will lead to the symptoms of the skin under the mouth is always red circle, at the same time in the arm localization will also appear erythema, you can follow the doctor’s advice to take anti-allergy drugs for treatment, such as cetirizine hydrochloride drops, and so on. 3. Drooling rash: children’s swallowing ability is not very coordinated, there may be the symptom of drooling, drool is not timely drying will trigger drooling rash, appearing under the skin of the mouth red circle of the symptom, the parents can choose to give the children regularly wipe moisturizing cream, is conducive to the recovery of drooling rash. When children appear under the skin of the mouth is always a red circle of symptoms, it is recommended to go to the hospital in time for examination and diagnosis, and under the guidance of the doctor for the treatment of medication, do not blindly give children medication, in order to avoid the emergence of adverse symptoms.