Children’s oral ulcers and herpes are two different diseases that differ in their focal manifestations, causes, prodromal symptoms, treatment and prognosis. 1. Focal manifestations: children’s oral ulcers is a periodic recurrence as the characteristics of the oral mucosa limited ulcerative damage, the ulcer surface was round or oval, whitish; children’s oral herpes is often formed on the mucosal surface in clusters of small blisters, the later may be broken to form an ulcer. 2. Pathogenesis: oral ulcers have not found the cause of the disease, generally believed to be an unbalanced diet, eating too much stimulating food, mental stress and micronutrient deficiencies, etc.; oral herpes is mostly due to viral infections. 3. Prodromal symptoms: oral ulcers do not have obvious general discomfort before they appear; oral herpes has a herpetic period before it appears, and there will be fever, malaise and other generalized symptoms. 4. Treatment: there is no specific treatment for oral ulcers, which is a self-limiting disease, and can be reduced through diet, improvement of living habits, vitamin supplementation, etc. Oral herpes can be treated with medicines such as Kailash under the guidance of a doctor. 5. Prognosis: oral ulcers are likely to recur after healing, but generally no sequelae; oral herpes once cured generally will not easily recur, if it is caused by herpes zoster virus infection may be residual neuralgia.