Children with ulcers at the corners of the mouth need to take appropriate measures according to the situation, there is no such thing as the fastest way to eliminate. If it is a viral infection, you can use antiviral ointment; if it is a bacterial infection, you can apply erythromycin ointment; if it is a trauma, do a good job of cleaning and disinfecting. 1. antiviral drugs, ulcers at the corners of the mouth, most of them are caused by herpes virus infection, good secondary to the cold period, you can apply antiviral ointment, such as acyclovir ointment. 2. Antibiotic ointment, consider the bacterial infection caused by, you can apply erythromycin ointment, mupirocin ointment and so on. 3. Trauma, small wounds, pay attention to keep the ulcerated parts of the clean, disinfected, dry, and slowly by itself can be improved. If the wound is large, it may need to be cleaned and sutured. Usually pay attention to let the child balanced nutrition, participate in outdoor sports, ensure sufficient sleep, improve resistance, if necessary, take the child to the hospital for treatment. The above drugs should be used under the guidance of a doctor.