Symptoms of flat warts are characterized by slightly raised flat papules of varying sizes. Flat warts are benign growths caused by human papilloma virus infection of the skin and mucous membranes. They are common in children and adolescents and occur on the face, back of the hands and forearms. The typical skin lesions for rice to soybean size flat elevated papules, round or oval, smooth surface, hard, normal skin color or light brown, more suddenly appear, the number of more and dense. After scratching, the lesions can be arranged in beads, i.e. autologous inoculation reaction. The course of the disease is chronic, most of the self-subdued, a few patients can recur. If the above symptoms are considered to be caused by flat warts, it is recommended to go to the regular hospital to find out the cause of the disease and timely treatment.