Redness around the baby’s mouth may be caused by contact dermatitis, xerostomia, xerostomia and other diseases, or it may be caused by other diseases such as eczema. 1. Contact dermatitis: contact dermatitis is mainly an allergic reaction caused by skin contact with external substances, the child will appear erythema, mild edema, pimples and other symptoms, but also itching, burning, swelling and pain and other symptoms. 2. Keratitis: Keratitis has a variety of causes, including fungal, bacterial and other pathogenic infections, trauma, contact and other factors. The main symptoms are congestion, redness, swelling and cracking of the corners of the mouth, as well as erosion, oozing and pain. 3. Lipitis: the etiology of lipitis is not yet clear, and it is considered to be caused by various factors such as sunlight exposure, climate change, local irritation and so on. Children with lip inflammation mainly manifested as swelling, itching, dryness, etc., and there will be lip thickening, ulceration, bleeding and other symptoms. 4. Other: eczema, herpes orofacialis and other diseases can also lead to redness around the mouth of infants. Redness around the mouth of infants, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.