If blistering occurs in the mouth, there is a high likelihood of localized mucous cysts or herpes simplex caused by a herpes simplex virus infection. Different treatments are available for the two different conditions. In the case of herpes simplex, oral antiviral medications such as acyclovir are needed. In addition, you need to drink a lot of water, eat a light diet, do not eat spicy and irritating food, usually in about 1-2 weeks slowly healing. If the mouth, lips mucus cysts, can not eat hard, relatively dry food, you need to eat thin, soft, liquid food, pay attention to do not often bite into the cysts, the treatment generally need surgical excision treatment.