Foot warts are usually referred to as plantar warts, which are generally not contagious after liquid nitrogen freezing has cured them. The actual plantar warts are a special type of warts caused by the human papilloma virus infection, trauma, friction and other factors may trigger, preferably in the palm and plantar. The first stage of the plantar warts is a small shiny papule, and then gradually increased to soybean, and later by extrusion will form a rough surface, clear boundaries of the flat papule. Plantar warts can be treated by freezing, electrocautery, laser and other physical therapy. Liquid nitrogen freezing treatment is through the low temperature to make the local tissue necrosis, when the warts completely off, usually is not infectious. However, some of the plantar warts are deep and large, a single freezing treatment can not be completely removed, need multiple freezing treatment to remove, so only when the liquid nitrogen freezing will be plantar warts cured, there is no contagious. In addition to physical therapy, you can also carry out topical medication, such as salicylic acid ointment, etc. Whether it is medication or physical therapy, it is necessary to carry out under the guidance of the doctor, to avoid self-operation.