Cryotherapy (freezing) is the application of extreme cold to destroy abnormal or diseased tissue, such as warts and verrucae, skin tags, solar keratosis and small skin cancers. Cryotherapy is a very common treatment carried out in our doctors' offices. It's minimally invasive and is often preferable to other forms of surgery because there's minimal pain involved and the cosmetic results are very good.
The dermatologist sprays the tissue or area to be treated with liquid nitrogen using a special canister with very precise nozzles. The substance freezes the skin surface, causing blistering. As your skin heals, the lesions peel off, allowing new skin to appear. Cryotherapy procedures take just a few minutes and the treatment duration depends on the size and number of lesions. For some conditions, such as warts, it may be necessary to have repeated treatments.
A sore or blister may form on the skin and you may have some discomfort for one to two days. It can take up to two weeks for redness and crusting to diminish and, in some cases, treatment may leave a small scar. For the best results, the treated area should be kept out of the sun, washed with soap and water, and kept dry.