Flat warts are benign excrescences caused by the human papilloma virus infecting the skin mucous membranes. Soybeans are food with no therapeutic efficacy and only provide nutritional value, and patients also need to be treated through medication, physics, surgery and other methods. Flat warts mostly occur in the face, back of the hand and forearms, etc., and its damage is often the number of more flat small papules, usually no conscious symptoms, the treatment is generally based on local drug treatment. The most common clinical drugs are salicylic acid, imiquimod ointment, interferon, fluorouracil ointment, etc., all need to be used under the guidance of professional medical personnel to avoid adverse reactions. Liquid nitrogen freezing, laser and other physical methods and surgical treatment can be used to treat flat warts.