Rotten corners of the mouth may be caused by malnutrition, such as the lack of multivitamins or anemia, usually need to supplement vitamins and folic acid to correct anemia, and can be supplemented with ferrous sulfate or calcium, zinc and other preparations, it is recommended to improve the body’s resistance. In addition, rotting corners of the mouth can also be caused by fungal infections or viral infections, which require the use of antifungal drugs, such as fluconazole or mycotoxin. For viral infections, antiviral medications such as acyclovir or ribavirin can be used, as well as topical acyclovir ointment. If the baby has a history of allergy or develops drug allergy or food allergy, it is recommended to detach from the allergens first, and anti-allergic drugs such as chlorpheniramine or loratadine can be used appropriately. If the baby has a trauma that produces rotting corners of the mouth, large traumas can be treated with stitches, if the trauma is shallow, it is recommended to keep the wound clean.