Flat warts often appear as flat, raised papules the size of a grain of rice to a soybean, usually rounded and oval, skin color or light brown, numerous and densely distributed. Warts are caused by the human papilloma virus that infects the skin and mucous membranes, and they are one type of warts that are common in children and adolescents and occur on the face, back of the hands, and forearms. As the name suggests, flat warts are often flat, raised papules, the size of a grain of rice to a soybean, round or oval in shape, skin color or light brown in color, with a smooth surface and a hard texture. They usually appear suddenly and are numerous and densely distributed. After scratching, there may be bead-like lesions arranged. Flat warts should go to the dermatologist, can be taken under the guidance of the doctor physical therapy and topical drug treatment. Physical therapy includes freezing, electrocautery, laser, etc. Topical medications include vitamin A ointment, imiquimod ointment, and so on. The medication should be used according to the doctor’s prescription.