Pediatric oral herpes is commonly caused by herpes simplex, which is caused by the herpes simplex virus. Once infected, this virus is carried for life and is prone to appear when the body’s resistance is lowered, such as colds, fever, exertion, late nights, low water intake, and so on. Once herpes simplex appears, it usually takes about ten days to heal. Mild herpes can be left untreated and self-healing. If the symptoms are more severe, acyclovir ointment can be applied to the affected area. Take oral antiviral solution, drink plenty of water, eat more fruits and vegetables, do not eat spicy, stimulating food, do not irritate the affected area.