Acyclovir is an antiviral drug that is mainly effective against herpes virus infections, such as herpes zoster or herpes simplex. Lichen planus is caused by human papilloma virus infection and acyclovir does not have a clear efficacy. The majority of the options for flat warts are drugs like retinoic acid, which inhibits epidermal overproliferation, regulates immunity, and is anti-inflammatory, commonly used as retinoic acid cream, tazarotene cream. You can also choose recombinant human interferon alpha 2b gel, which has an antiviral effect. In addition, Imiquimod cream also has a good anti-viral and immune modulating effect. In addition to medication, flat warts can also be treated with cryotherapy or laser treatment.