Why Is Liquid Nitrogen Used in Cryotherapy for Lesion Removal?

During treatment, liquid nitrogen is applied to a selected area with a spray or a probe. Rapid cooling forms ice within and around the targeted cells. As the area thaws, the damaged tissue is gradually cleared and the skin begins to repair itself. The treated spot may sting, swell, redden, blister, or form a crust before healing. The depth and duration of freezing are chosen according to the lesion, its site, and the surrounding skin.

Cryotherapy is not suitable for every bump, mole, or changing mark. A lesion that has not been assessed may need examination or sampling before destruction, because freezing can make later diagnosis more difficult.

Keep the area clean and follow the dressing instructions given by the clinician. Do not deliberately break a blister or pick the crust, because this can delay healing and introduce infection. Protect the site from friction and sun while it recovers. Use only the pain relief or wound products recommended for you, particularly if the treated area is near the eye, mouth, or genitals.

Contact the clinic if redness spreads, pain becomes stronger instead of settling, swelling is severe, pus or fever develops, or the wound does not begin to heal. Return for review if the lesion persists, returns, bleeds, or changes after treatment.

Ask what the lesion is thought to be, why freezing is suitable, what reaction to expect, how to care for a blister or crust, and when the area should be checked again.