A circle of red rash around the baby’s mouth may be caused by drooling rash, skin allergies, pediatric perioral dermatitis, etc., timely cleaning of saliva, avoid contact with allergens, medication to relieve. 1. Drooling rash: infants will often have the performance of drooling, the skin around the mouth is often stimulated by moisture, skin cuticle damage triggered by drooling rash, manifested as a circle of red rash around the mouth. Infants and children drooling to take a soft gauze towel to wipe off, keep lips and face clean and dry, in the mouth around the appropriate amount of moisturizing milk, may improve the symptoms. 2. Skin allergy: infants add complementary foods after eating some easily allergic to food, such as mango, pineapple, fish and shrimp, etc., will be in the mouth around the appearance of some red rashes, consider the skin allergies. To remove the allergic factors in time, find out the allergens, avoid contact with allergens, the rash is more serious in the doctor’s guidance, such as Dinaid cream and other drugs to relieve. 3. Pediatric perioral dermatitis: infants in the dry and windy season, often use the tongue to lick the lips and lips around the mouth, triggered by pediatric perioral dermatitis will also have a circle of red rash around the mouth, try to avoid licking the lips and lips around the mouth, to keep the surrounding area moist, clean. If the rash around the baby’s mouth is more serious, it is recommended to consult a doctor in time for examination and treatment.