There are many symptoms of herpes virus on the mouth, such as blisters, pain, and systemic symptoms. 1. Blisters: Herpes virus can cause small blisters on the skin and mucous membranes around the mouth, mainly in clusters of small blisters, and there is a tendency to merge with each other. 2. Pain: After the blisters are caused by the herpes virus on the mouth, there is also localized pain and a burning sensation, which can occur before the blisters. 3. Systemic symptoms: If the herpes virus on the mouth is more serious, it may also cause systemic symptoms, such as high fever and generalized weakness. There are many symptoms of herpes virus on the mouth, after the appearance of the above symptoms, it is recommended to go to the hospital in a timely manner to improve the examination, under the guidance of the doctor to take standardized treatment, do not ignore the symptoms, take it lightly.