Flat warts are skin lesions caused by HPV3 and HPV5 infections of the papilloma virus. In traditional Chinese medicine, it is believed that it is because of the wind and heat poisonous evils in the skin or viruses caused by. In the clinical manifestations of common warts, including filiform warts, plantar warts, warts on the bed of the nail, warts under the nail, it appears mainly for HPV-2.4, type 7 human papillomavirus caused by the epidermal benign growths. The symptoms of common warts are usually found on the hands and feet of the patients, and they are only single at first, but can increase due to the phenomenon of self-inoculation. The skin lesions are rounded or polygonal papules, from the tip of a needle to the size of a peanut, grayish yellow, dirty brown or normal skin color, without a red halo around, the surface performance is relatively rough, the phenomenon of keratinization is also more obvious, usually appear as a stamen or thorns, slightly hard to the touch, have a sense of stinging, but not like the hedgehog's bristles as sharp and hard. They are usually found in children and adolescents. Flat warts are most common on the face and back of the hands. The symptoms of flat warts are more obvious, the patient at the onset of the cheeks of the face, frontotemporal, eyelids or the back of the hands of the skin protruding dotted warts, and will gradually become larger. The warts on the backs of the hands are often pie-shaped, while those on the face tend to be small, light-brown patches. The patient's face is like sticking to the broken tobacco leaves, a few can be a few, more can be hundreds, some scattered, some in groups, but also due to the finger scratching and spread, for the patient caused by the impact is more serious.