The local treatment of herpes simplex is based on absorption, drying and prevention of secondary infection. 2% methyl violet solution can be used topically, and 0.5% neomycin ointment can be used in case of secondary infection, etc. When the symptoms are serious, you can use 2%-5% acyclovir cream and 2% phthalidone ointment topically to make the pain disappear, dry the lesions and shorten the course of the disease. Oral drugs can be chosen from open-chain guanosine derivatives, including acyclovir, valacyclovir, and famciclovir. These antiviral drugs can reduce symptoms, shorten the course of the disease, reduce detoxification, and reduce infectivity, but they do not prevent the establishment of latent infection or change the frequency of recurrence. Herpes simplex is caused by the human herpes simplex virus and infects mucous membranes and injured skin anywhere in the body, and is particularly susceptible to infecting the skin mucous membranes of the mouth, lips, eyes, and other cavity areas. Herpes simplex is prone to recurrence, and the damage consists of dense clusters of pinhead-sized blisters, often in groups of one or two or three, which rupture to reveal a vesicular surface that gradually dries and crusts, with a self-conscious burning and itching sensation.