Cryotherapy is compressed liquid nitrogen in a metal spray bottle. The spray is applied in a very directed manner to treat pre-cancerous lesions. Liquid nitrogen is very cold (-170°F). Cryotherapy creates a small freezer burn, which removes the damaged or, precancerous cells on the surface of the skin. The treated area then blisters, turns into a crust, and the pre-cancerous cells slough off. This process of sloughing takes approximately one to two weeks.
Cryotherapy cures most pre-cancer lesions. Liquid nitrogen spray is also used to treat many benign lesions such as small skin tags, warts, seborrheic keratoses, and lentigines.