The reason for this is the human papilloma virus infection. The actual topical medications that can be used to get rid of them include recombinant human interferon alpha-2b gel and imiquimod cream. Topical retinoids are also available, including tazarotene gel. Topical keratolytic agents, such as 10%-20% salicylic acid ointment, are also available. For systemic drug therapy, immunity enhancing drugs are mostly chosen clinically, such as transfer factor capsules and thymidine enteric-coated tablets. For physical therapy, liquid nitrogen cryotherapy, electrocautery and pulsed laser treatment are available.