Herpes on the tongue in children can be caused by oral herpes, hand, foot and mouth disease, oral ulcers and other factors. 1. Oral herpes: oral herpes is often caused by viral infections and other reasons, mainly caused by herpes simplex virus infection, in the formation of blisters after about 2~3 days time can occur after the rupture of the formation of localized ulcers. 2. Hand, foot and mouth disease: If there are red spots or small herpes on the tongue, and the same manifestations also appear on the palms of the hands, feet and other parts of the body, it is necessary to consider that hand, foot and mouth disease may have occurred. 3. oral ulcers: due to stress, lack of trace elements, low immunity and other factors, can trigger oral ulcers, can occur on the tongue, can appear shaped like herpes-like ulcers performance. Children with herpes on the tongue, 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.