Corns are a kind of limited cone-shaped keratosis associated with long-term pressure and friction on the skin of the foot. Liquid nitrogen freezing and laser can treat corns, but due to individual differences, there is no saying which one is better. 1. Liquid nitrogen freezing: liquid nitrogen is sprayed directly on the affected area, and there will be cooling when the liquid nitrogen is in contact with the skin, which can make the lesion skin frostbite, necrosis and shedding. Liquid nitrogen freezing is suitable for the superficial layer of the skin, smaller corns, and requires multiple treatments. 2. Laser: the common carbon dioxide laser treatment, is the use of laser photothermal effect, the lesion tissue gasification, laser treatment can minimize the damage to normal tissue, and short treatment time, small trauma. For patients with corns, it is recommended to go to a regular hospital and choose the appropriate treatment under the guidance of the doctor.