The most common type of warts is the human papilloma virus type 3, 10, 28, 41, which invades the epidermis and causes skin disease, mostly in adolescents, so it is called youth warts, usually on the face, the back of both hands and forearms skin, the skin lesions are mainly pinhead to sesame grain size flat elevated small papules, light red, dark red or flesh color, the shape is usually round or irregular, the boundary is clear, there is a certain degree of contagiousness. It can appear isomorphic reaction, so usually can not scratch, can not use the scrubbing towel to rub the skin hard, generally no conscious symptoms or slight itching. The treatment can be topical vitamin A acid cream or imiquimod cream, if the number of small can go to the hospital dermatology to do laser or liquid nitrogen freezing treatment, the number of large can take oral Chinese medicine conditioning, generally need to treat 1-3 months of time, in addition, you can also try Ira photodynamic and Chinese medicine fire needle treatment.