The cryotherapy unit contains liquid nitrogen, which is extremely cold. Cryotherapy (liquid nitrogen) treatment of a flat wart on the hand.
Liquid nitrogen can be applied by spray device, as seen here, or delivered by a cotton-tipped applicator. The white area in the photograph is the frozen, or "frosted", wart that has just been treated by liquid nitrogen spray.
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Cryosurgery 

Picture of Cryosurgery: The cryotherapy unit contains liquid nitrogen, which is extremely cold. Divider line
The cryotherapy unit contains liquid nitrogen, which is extremely cold.
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Overview
Cryosurgery uses liquid nitrogen, a very low-temperature liquid, to destroy noncancerous (benign) and some cancerous (malignant) skin lesions. It is a common treatment option because of its low cost, ease of use, and effectiveness. When used by properly trained and experienced physicians, cryosurgery can remove a lesion with good cosmetic results.
Last Modified: 22 Dec 2008