The doctor sprays liquid nitrogen onto the cancer to freeze it. It can be a bit painful when the liquid nitrogen is applied. Some people describe the feeling as being like a bee sting.
After treatment, the area may ache or throb for a minute or two. After about an hour or so, the area may blister. This is normal. The blister may contain blood. Your doctor or nurse may need to drain the fluid from the blister using a sterile needle. But the top of the blister should be left intact.
Keep the treated area covered with a dressing until a scab forms. About two weeks after your treatment, the scab drops off and the cancer cells should have cleared. You may have a scar in the area. Occasionally, you may need more than one cryotherapy treatment to get rid of the cancer completely.