Children with flat warts are infected with the human papilloma virus and can be treated accordingly, including medication, physical therapy, and surgery. Flat warts are caused by human papillomavirus infection, mostly seen in teenagers. It is a self-limiting disease, most of them can go away with time, but it often takes a long time, so you need to consult a doctor in time, active treatment. Clinical drugs used to treat flat warts include retinoic acid ointment, imiquimod ointment, interferon gel, and so on, which should be used in accordance with the doctor’s instructions to avoid adverse reactions. Liquid nitrogen freezing, CO2 laser and other physical methods to treat flat warts also have a certain effect, can also choose to surgical excision.