Liquid nitrogen freezing can treat common warts. Liquid nitrogen freezing is a commonly used physical treatment for common warts, which are benign skin lesions caused by human papillomavirus infection. The warts can be necroticized and detached by freezing at low temperatures. If the number of skin lesions is large, the treatment can be done in several sessions. The actual warts can be found on any part of the body, mostly on the hands and feet, and the skin damage is a soybean-sized or larger rash, gray, brown, brown or skin color, rough surface, hard texture, and the appearance of the papillae hyperplasia. The actual warts need to go to the regular hospital dermatology examination and diagnosis, in the doctor’s guidance to take the appropriate treatment measures.