Liquid nitrogen freezing is mainly used to treat benign proliferative diseases of the skin surface, such as metatarsal warts, dermatophytes, keloid scars, etc., through the extremely low temperature effect on the tissues to make them necrotic and shedding, to achieve the purpose of treatment of diseases. 1. metatarsal warts: due to the plantar skin infection caused by the human papilloma virus, manifested in the plantar appearance of keratinized pimples, will gradually expand over time into a rounded keratinized plaque, but also look at the capillary congealed into a small black spots. 2. Dermatomas: a benign skin tumor, known as soft fibroids, the pathogenesis is not clear, often manifested as raised in the skin of rice-like polyps, no pain when pressed, soft and inelastic. 3. Keloid: In the process of wound healing after skin injury, the connective tissue in the scar tissue proliferates excessively and forms plaques, but in the clinic, some malignant tumors will also form similar plaques, so it is necessary to be vigilant. Liquid nitrogen freezing is the use of low-temperature freezing of local tissues to treat diseases, can treat a lot of diseases, such as the need to use liquid nitrogen freezing technology to treat, please go to a regular hospital to receive treatment, do not operate on your own to prevent frostbite.