Blistering of the lips and mouth, also known as herpes labialis. It is a viral infection. Treatment: i. Antiviral drugs, including acyclovir, ribavirin, interferon and polymyxin, vaccines and immunoglobulins. II. Immunomodulators and others, including thymosin, transfer factors, levamisole, and cyclooxygenase inhibitors. Third, topical medications, including 0.1%-0.2% chlorhexidine solution, compound boric acid solution, 0.1% levano solution; pastes, including 5% gentamycin glycerin paste, 0.5% dacronin paste; bulk, such as tin powder, nourishing yin and muscle mass powder, watermelon cream powder; containing tablets, available chlorhexidine gluconate tablets. When herpes labialis is secondary infection, warm saline, 0.1%-0.2% chlorhexidine solution can be used as wet compresses; fourth, physical therapy, localized helium-neon laser treatment; fifth, symptomatic and supportive therapy; sixth, traditional Chinese medicine.