Acyclovir cream is a topical topical drug, which belongs to the category of dermatological drugs over-the-counter. It is a white ointment whose main ingredient is acyclovir and excipients are petroleum jelly and glycerin. Its mechanism of action is to interfere with the viral DNA polymorphase and thus inhibit the replication of viral DNA. Acyclovir cream can be used for the treatment of a variety of diseases, for example: 1, herpes simplex virus infection: mainly used for herpes simplex caused by type I herpes simplex virus and genital herpes caused by type II herpes simplex virus. For unbroken vesicles can be applied topically with acyclovir cream 3-4 times a day; genital herpes can be applied topically with 3% acyclovir cream. 2. Herpes zoster: mainly apply acyclovir tablets or acyclovir injection. 3, treatment of chickenpox in immunodeficient people. Topical treatment with compounded acyclovir cream can be applied. The treatment aims at anti-inflammatory, astringent, antibacterial as well as preventing mixed infections. In addition to those listed above, acyclovir cream can also be used for plantar warts, recurrent erythema multiforme, herpetic eczema, lymphomatoid papulosis, and trichomatous mucous membrane leukoplakia. However, it should be noted that patients who are allergic to ganciclovir may also be allergic to acyclovir, so it is important to consult a medical professional when using the drug to avoid life-threatening misuse.