The Bottom Line
Cryotherapy uses extreme cold (liquid nitrogen at -196°C) to destroy abnormal skin cells by freezing them. It's one of the most common dermatologic procedures, used for warts, skin tags, actinic keratoses (precancers), seborrheic keratoses, and some skin cancers. The procedure takes seconds, requires no anesthesia, and heals within 1-3 weeks. It's effective, affordable, and performed in-office with minimal downtime.
How Cryotherapy Works
Liquid nitrogen (-196°C / -321°F) is applied to the skin via a spray device or cotton-tipped applicator. The extreme cold causes:
- Ice crystal formation: Within cells, damaging cell membranes and organelles
- Blood vessel disruption: Cutting off blood supply to the treated tissue
- Immune response: The damaged tissue triggers an inflammatory reaction that helps eliminate abnormal cells (particularly important for warts, where the immune response targets the virus)
The freeze-thaw cycle is key: rapid freezing followed by slow thawing causes maximum cell destruction. For some lesions, two freeze-thaw cycles in a single session improve success rates.
Conditions Treated with Cryotherapy
- Common warts: 60-70% cure rate with a single treatment; up to 90% with multiple treatments spaced 2-3 weeks apart
- Actinic keratoses (precancers): First-line treatment. 75-99% clearance rates. Prevents progression to squamous cell carcinoma.
- Seborrheic keratoses: "Barnacles of aging" — brown, waxy growths. Cryotherapy removes them in one session.
- Skin tags: Quick and effective. One brief freeze is usually sufficient.
- Molluscum contagiosum: Viral bumps common in children. Each lesion is frozen individually.
- Small basal cell carcinomas: Select superficial BCCs in low-risk locations can be treated with cryotherapy.
- Solar lentigines (age spots): Light freezing can remove flat brown spots.
What to Expect
During:
- Sharp stinging/burning sensation for 5-15 seconds during freezing
- Throbbing for 1-2 minutes after
- No anesthesia typically needed (lidocaine injection for larger or sensitive areas)
- Total treatment time: seconds to minutes per lesion
After:
- Hours 1-24: Redness, swelling, possible blister formation (clear or blood-filled blisters are normal)
- Days 1-7: Blister dries into a scab. DON'T pick or pop blisters — let them heal naturally.
- Days 7-21: Scab falls off, revealing new pink skin underneath. Full healing in 2-4 weeks.
- Long-term: The treated area may be lighter (hypopigmentation) or darker (hyperpigmentation) than surrounding skin. Hypopigmentation is more common and may be permanent in darker skin.
Frequently Asked Questions
Does cryotherapy hurt?
There's a brief, intense stinging during freezing (5-15 seconds), followed by throbbing that subsides within minutes. Most patients describe it as very tolerable. Areas with more nerve endings (fingertips, around nails) are more sensitive. Children may need topical lidocaine before treatment.
Will the wart come back?
Warts can recur because the virus (HPV) may persist in surrounding skin. Single-treatment cure rates are about 60-70%; with repeated treatments, up to 90% of warts resolve. Stubborn warts may need combined treatment (cryotherapy + topical immunotherapy or salicylic acid).
Is cryotherapy safe for darker skin?
Yes, but with an important caveat: cryotherapy frequently causes hypopigmentation (lightened skin) at the treatment site, which is more noticeable on darker skin and may be permanent. For cosmetically sensitive areas in darker-skinned patients, alternative treatments (topical acids for warts, electrodesiccation for skin tags) may be preferred. Discuss options with your dermatologist.
- Kuflik EG. "Cryosurgery for skin cancer: 30-year experience and cure rates." Dermatologic Surgery. 2004;30(2 Pt 2):297-300.
- Andrews MD. "Cryosurgery for common skin conditions." American Family Physician. 2004;69(10):2365-2372.
- Thai KE, et al. "Cryotherapy of common viral warts at intervals of 1, 2, and 3 weeks." Australasian Journal of Dermatology. 2004;45(1):15-17.