What should you know about liquid nitrogen?

Liquid nitrogen rapidly cools tissue. In dermatology, a clinician applies it to a selected lesion so ice forms within the treated area. The goal may be to remove a superficial growth or destroy abnormal tissue. The clinician chooses the application method and exposure based on the lesion, its location, and the surrounding skin.

Stinging, redness, swelling, or a blister can follow treatment. The treated area may crust and then heal over time, sometimes with a temporary change in colour. Freezing is not suitable for every mark; a changing, bleeding, or uncertain lesion may need diagnosis before treatment. Cryotherapy (Lesion Removal) describes this clinical use.

Keep the area clean and follow the clinic's dressing instructions. Do not deliberately break a blister; if it opens, wash gently and cover it with a clean dressing. Avoid rubbing, picking, and unapproved creams. Protect healing skin from sun exposure, and tell the clinician if you have poor wound healing, reduced sensation, or a history of unusual scarring.

Arrange the planned review because some lesions need reassessment or another treatment decision. Ask how to manage discomfort and whether bathing, exercise, or work needs modification while the site heals. Store and handle liquid nitrogen only in a properly equipped clinical setting; it can cause serious cold injury.

Contact the clinic for worsening pain, spreading redness, pus, fever, persistent bleeding, or a wound that is not healing as expected. Seek urgent care after accidental exposure to liquid nitrogen, especially if skin is numb, pale, hard, or severely painful. Eye exposure or breathing difficulty requires immediate emergency attention.

Ask: What lesion are we treating, and was it examined first? What will the site look and feel like as it heals? How should I care for a blister or crust? Could colour change or scarring occur? When is review needed, and what would prompt a different treatment?