The warts can be removed by physical therapy, medication and other methods. 1. Physical treatment: patients with common warts on the arm can use liquid nitrogen for freezing treatment, so that the warts are necrotic and fall off. You can also choose laser treatment, the use of laser heat to destroy the warts, so that they fall off. 2. medication: for patients who are not suitable for physical therapy, you can apply tazarotene gel, retinoic acid cream and other retinoic acid drugs, which can regulate the differentiation of epidermal cells. You can also apply imiquimod cream to the affected area, which has antiviral and immunosuppressive effects. For patients who have common warts on their arms, they should go to the hospital and choose the appropriate removal method under the guidance of the doctor.