Flat warts on the skin may be improved by physical therapy, medication and other ways. 1. Physical therapy: Patients with flat warts on the skin can choose carbon dioxide laser treatment to make the warts necrotic and fall off. You can also choose cryotherapy, which uses the low temperature of liquid nitrogen to kill the diseased tissue. 2. medication: for physical therapy repeated new or not suitable to use physical therapy patients, you can follow the doctor’s instructions for the external use of salicylic acid and other drugs, to promote epidermal exfoliation. You can also use interferon, imiquimod cream and other drugs, which can increase and activate cellular immunity. For patients with flat warts on the skin, it is recommended to go to a regular hospital, with the doctor standardized treatment.