If the blisters are caused by lip licking, pencil biting and certain diets, there is no need to go to the hospital, just pay attention to personal hygiene and rest, and adjust the diet to recover; if the blisters are caused by staying up late or eating food on fire, you can first take Chinese medicine to clear the heat and detoxify the mouth, and then go to the hospital if it is not effective.
If the blistering at the corners of the mouth is not caused by the above-mentioned actions, it is recommended to go to the hospital immediately to further confirm the cause of the disease for symptomatic treatment.