The ointment for flat warts includes salicylic acid ointment, retinoic acid ointment, recombinant human interferon alpha-2b gel, 5% imiquimod cream and so on. 1. Salicylic acid ointment: the main component of salicylic acid ointment is salicylic acid, this kind of drug has the effect of keratolytic, is a kind of keratin softener, mainly through the promotion of epidermal exfoliation to play a therapeutic role, can be eliminated flat warts. 2. Vitamin A acid ointment: the main component of vitamin A acid ointment is vitamin A acid, this kind of drug is mainly through the regulation of immunity, the regulation of the proliferation of epithelial cells, to achieve the therapeutic effect of flat warts. 3. recombinant human interferon alpha-2b gel: the main component of this drug is recombinant human interferon alpha-2b, is a broad-spectrum antiviral drugs, can inhibit the growth of the virus, but also enhance the cellular immunity and viral resistance. 4.5% imiquimod cream: the main ingredient of this drug is imiquimod, which is a kind of immunomodulator, although it does not have the effect of anti-virus, but it can regulate the immune system, activate the immune cells, guide the body to recognize the virus and inhibit viral replication, so as to play a role in anti-virus. All of the above drugs may have adverse reactions. If you are diagnosed with flat warts, you should choose the appropriate medication under the guidance of your doctor, and should not use the medication blindly on your own to avoid adverse reactions.