Flat warts are a type of warts, a common skin disease that is contagious and easier to diagnose. Flat warts are a skin disease that occurs after infection with the human papilloma virus. Flat warts are characterized by small, flat papules protruding from the surface of the skin, brown and light brown in color, with a smooth surface, and are mainly distributed on the skin of the face and the back of the hands and other exposed parts of the skin. Flat warts are contagious and can be spread through close contact and scratching. If the local skin is broken, or the immune system is relatively low, contact with the flat warts rash, or containing viral infection of the goods, then it may be infected. It is recommended that patients with flat warts go to the hospital in a timely manner, under the guidance of the doctor to actively treat, to prevent the infection from becoming more and more serious.