Cryotherapy
Liquid nitrogen is sprayed or dabbed onto a spot to freeze and destroy it. It is a standard treatment for warts, precancerous sun spots and some harmless growths. It commonly leaves a pale mark that does not fully come back.
Key facts
Treats
Warts and selected skin growths
Recovery
Blister or scab for 1–3 weeks
Treatment plan
One or more treatments, lesion-dependent
Typical cost
Priced per lesion or visit
What is it?
It freezes tissue.
Liquid nitrogen destroys selected tissue through freezing and thawing.
It treats diagnosed lesions.
It is used for benign or precancerous spots.
It leaves no specimen.
Nothing remains for microscopic examination.
Uncertain moles should not be frozen.
A diagnosis is needed first.
Treatment areas
Cryotherapy
The specific lesion, scar or affected patch determines the treatment site; there is no fixed body distribution.
Cryotherapy
The specific lesion, scar or affected patch determines the treatment site; there is no fixed body distribution.
Skin tones
Lighter skin
Some risk
A pale mark may not fully return.
Medium skin
Some risk
Pale or dark marks are more visible.
Deeper skin
Higher risk
Lasting pale patches are common; ask about alternatives.
How it works
Diagram explanation
A selected lesion is frozen: A clinician applies liquid nitrogen to the treatment area. Cold injures the tissue: A controlled freeze-thaw response damages the target. The treated area sheds and heals: A blister or crust may form; repeat treatment can be needed.
Schematic illustration. Technique and response vary. This explains a mechanism and does not specify treatment settings.
Before your treatment
The week before
A few days before: Thick warts: Soaking and filing the wart with a pumice stone or emery board helps the freeze reach the wart, not the callus on top.
Ask your provider: Several spots: If more than one spot is planned, ask to start with one and see how the skin heals.
Day of treatment
Arrival & prep
The spot is examined first — the most important part of the visit.
Treatment
Liquid nitrogen is sprayed or dabbed on until a white frozen halo covers the spot and a small margin.
A sun spot takes seconds; a wart takes longer and is usually thawed and frozen again the same visit. It burns and stings, peaking as the skin thaws, then aches for a few hours. Fingertips, toes, soles and ears are sorest. Brief and unpleasant, not severe.
Before you leave
Red, swollen and tender, sometimes blistering within the hour.
After your treatment
First 24 hours
Days 1 to 3: A clear or blood-filled blister is expected, not a sign anything went wrong.
Days 2–7
Days 4 to 14: The blister dries into a dark crust with the growth on top, and lifts off on its own over one to two weeks.
Weeks 2–4
Weeks 2 to 8: New skin is pink and delicate.
Time to results
1–3 weeks
How long results last
Permanent for growths; warts may need repeats
Risks
Pain, swelling, a blister and a crust are expected. The risks worth naming are the ones that last.
A pale mark that is not filling back in
Pigment loss at the site is common, and after a hard freeze permanent. Say so — it changes what should be used on any remaining spots.
A dark mark
Post-inflammatory hyperpigmentation, a brown mark left after inflammation. More common on deeper skin tones and after sun, and treating it early shortens it.
Numbness or tingling
Nerves close to the surface, particularly at the sides of the fingers and toes and near the ear, can be injured. Recovery usually takes months, sometimes far longer.
A raised or thickened scar
More likely on the chest, shoulders, upper back and jawline, and in anyone who has had a keloid.
Hair loss in the treated patch
Follicles are cold-sensitive, so freezing the eyebrow, beard or scalp can leave a bald patch that does not regrow.
Still not healed after 4 weeks
Especially on the lower leg, where circulation is poorer and a frozen spot can turn into a slow ulcer.
The growth is back or never went
Common with warts and expected. A sun spot that returns should be sampled, not frozen a third time.
Cost
Typical cost
Per lesion or per visit
Pricing
Cosmetic prices vary a lot and are usually quoted per lesion or per visit, cheaper per spot when several are done at once.
Insurance
In the US, freezing warts and precancerous sun spots is billed as medical treatment, so you pay your copay or whatever the deductible has not covered.
Alternatives
Salicylic acid for warts
Daily treatment at home over weeks to months, with soaking and filing. Slower and needs persistence, but it does not bleach the skin and costs very little. It works better still alongside freezing.
Cantharidin for warts and molluscum
Painless when applied in the office, then blisters hours later. Useful in children who cannot tolerate freezing, and less likely to leave a pale mark.
Injected immunotherapy for stubborn warts
An antigen is injected into a wart every few weeks, and warts elsewhere on the body sometimes clear too. Can cause a flu-like day afterwards. Reserved for warts that have not responded.
5-fluorouracil or imiquimod cream
For precancerous spots. Treats a whole sun-damaged area rather than the visible spots one at a time, which usually means fewer new ones later. The trade is weeks of visible redness, crusting and discomfort instead of one appointment.
Curettage and electrodesiccation
The growth is scraped off and the base sealed with heat. Comparable marking risk, more precise control of the edges, and it can provide tissue for the laboratory if there is any doubt.
Shave or excision biopsy
The only option that removes the spot and tells you what it was. This is the right choice, not freezing, for anything pigmented, changing or uncertain.
Salicylic acid wart treatments, 17% liquid or 40% plaster
The best-supported home option for warts on the hands and feet. Soak, file the surface, apply daily, and expect weeks to months. Cheap, and it leaves no pale mark.
Over-the-counter freeze sprays for warts
A propellant gas that is cold but far warmer than liquid nitrogen and much harder to aim. Reasonable for a small wart on a hand, often not enough for a thick or plantar one. It can still blister and still leave a pale mark. Never on the face, and never on a mole or any spot that has not been looked at.
Duct tape over a wart
Trials are mixed and it is harmless to try alongside salicylic acid. It is not a reason to skip treatment that works.
Questions
Does freezing leave a white mark?
Often. Pigment cells die at milder cold than the growth, so most effective freezes take some color out. Some returns over months; a good part does not. The mark is usually a little wider than the spot and stands out far more on deeper skin tones — worth discussing before you agree.
Can a mole be frozen off?
No. Freezing destroys the tissue without a diagnosis, so a skin cancer can heal over at the surface while it keeps growing underneath. Anything pigmented, new or changing gets examined and sampled, and moles that need removing are cut out and sent to a laboratory. Same for at-home freezing and mole removal pens.
How much does it hurt?
A sharp burning sting for ten to thirty seconds during the freeze and the thaw, then an ache for a few hours. Fingers, toes, soles and ears are worst. Brief and genuinely unpleasant rather than severe, and ordinary painkillers are enough.
Is the blister normal, and should I pop it?
Normal, and it is how the treatment works — the skin separates and lifts the growth off with the blister roof. Leave it alone and cover it. If it is large, tense and painful, the clinic can drain it, which beats tearing the roof off yourself.
How many treatments will my wart need?
Usually several, every two to four weeks. Many clear over three to six treatments, some need more, and some never respond. Salicylic acid at home in between improves the odds. If nothing has changed after three or four sessions, ask about a different approach.
Are the drugstore freeze kits the same as what a doctor uses?
No. They use a propellant gas much warmer than liquid nitrogen and harder to aim, so they are weaker on thick and plantar warts. They can still blister and leave a pale mark. Not for the face, and never on a mole or an unexamined spot.
Related
Actinic Keratosis
Seborrheic Keratosis
Skin Tags
Warts
Keloids
Melanoma
Cantharidin vs Cryotherapy
Cryotherapy vs Electrodesiccation and Curettage
Cryotherapy vs Mohs Surgery
Cryotherapy vs Photodynamic Therapy
Cryotherapy vs Shave Removal
