Blisters in the mouth may be the result of herpes, which is usually caused by a virus, mostly the herpes simplex virus, and can usually be treated with antiviral medications. Oral medications include acyclovir, valaciclovir or ganciclovir, or you can use virazole, also known as ribavirin, which can promote its healing. According to the latter, acyclovir ointment can also be used on the surface, or in severe cases, an antiviral drug such as adenosine monophosphate can be administered intravenously and can be effective. In addition, blisters in the lips may also be caused by mucous gland cysts, such as inadvertent lip biting or biting, when mucous gland cysts appear. This kind of mucus gland cyst usually needs to be removed surgically, and after the surgical removal treatment, the sutures and stitches can basically be healed, but it is easy to recur.