Which medical procedure involves liquid nitrogen being sprayed or painted onto a small malignant lesion to freeze and destroy the tissue?

Cryosurgery

Cryosurgery involves the use of intense cold produced by liquid nitrogen (or carbon-dioxide or argon) to freeze and damage abnormal tissues, such as tumors. It can be performed to treat cancer when other forms of treatment have failed. Cryosurgery is used to treat tumors both inside and outside the body. The risks associated with cryosurgery include infection, ulcers, damage to nearby healthy tissue and sexual dysfunction.