What should you know about nitrous oxide for warts?

A trained clinician directs a nitrous oxide spray or probe at the wart. The rapid cooling damages cells in the treated area, and the body clears the injured tissue as new skin forms. Stinging, redness, swelling, blistering, and a temporary change in skin colour can follow.

The treatment choice depends on the wart's location, thickness, number, and appearance. Options may include [Imiquimod Treatment](/treatments/medical-dermatology/imiquimod-therapy/), [Cryotherapy (Lesion Removal)](/treatments/surgical-dermatology/cryotherapy-lesion-removal/), or [Electrosurgery](/treatments/surgical-dermatology/electrosurgery/). A clinician should confirm that the growth is a wart before treatment.

Keep the treated skin clean and follow dressing instructions. Do not burst a blister unless the treating clinician tells you to; if it opens, wash gently and use the recommended covering. Reduce rubbing from footwear or clothing, and avoid picking at a crust.

Mention diabetes, circulation problems, reduced sensation, immune suppression, or previous abnormal scarring before treatment. Do not use a home freezing product on a changing or bleeding growth.

Seek advice for worsening pain, spreading redness, increasing warmth, pus, fever, or red streaks. Arrange reassessment if the treated site is not healing, the wart returns, or the growth changes shape or colour. A lesion near the eye, genitals, or nail needs a clinician's assessment rather than self-treatment.

Ask why this method suits the wart, what reaction is expected, whether another treatment is preferable, and how you will know that healing is progressing normally.