Flat warts on the nose can be treated by physical therapy, topical medication, and systemic medication. Flat warts are benign excrescences of the skin and mucous membranes caused by human papilloma virus infection and can be treated as follows. 1. Physical therapy: commonly used methods include freezing, electrocautery, laser, scraping and so on. 2. Topical medication: such as retinoic acid ointment, phthalidomide cream, imiquimod cream and so on. 3. Systemic drug therapy: there is no exact anti-human papilloma virus drug, you can choose immunomodulators, commonly used drugs are interferon, thymidine, levamisole and so on. The above drugs need to be used as prescribed by the doctor.