Plantar warts usually fall off gradually in about 20-30 days after freezing. Plantar warts are viral infections, a proliferative disease caused by the human papilloma virus that infects the skin and occurs on the bottom of the foot. The use of liquid nitrogen freezing, mainly through the ultra-low temperature liquid to destroy the local proliferation of tissue to achieve the effect of treatment. The temperature of liquid nitrogen reaches minus 200 degrees Celsius, so after freezing, the local skin surface will form blisters, a few days later the blisters will rupture, then the skin surface will form a blood crust, after the blood crust completely fall off plantar warts will gradually fall off. The whole process generally takes 20-30 days, the treatment cycle is slow, must have patience.