Cutaneous warts are caused by human papillomavirus, a double-stranded DNA virus that infects epidermal keratinocytes and drives them to proliferate. The raised, rough lesion is the visible output of that infection. Common warts account for roughly 70% of cutaneous warts and usually appear on the hands and feet.
This article covers cutaneous warts — hands, feet, face, body. Anogenital warts are a separate clinical situation and are not addressed here.
Key Facts
- HPV — human papillomavirus, a double-stranded DNA virus — the wart is the visible consequence of an infection in the epidermis
- 65–78% — the spontaneous resolution rate reported for warts without any treatment at all, as the immune system clears the infection
- −196°C — the temperature of liquid nitrogen used in cryotherapy, which ruptures cell membranes through ice crystal formation
- 16.7–35% — the range of recurrence rates after cryotherapy reported across the literature
- 19.6% — the overall recurrence in a retrospective review of 560 hand and foot wart patients — 12% foot-only, 27.3% hand-only, 31.3% both
- 2 weeks — the cryotherapy interval associated with lower recurrence than a 3-week interval in that same 560-patient review
- ~70% — the share of cutaneous warts that are common warts, typically on hands and feet
- Highest of all modalities — cryotherapy's ranking for both recurrence odds and adverse event rate in a network meta-analysis of palmoplantar wart treatments
Why recurrence is the number that matters
Every destructive treatment — cryotherapy, electrocautery, laser, acids — removes the lesion. None of them removes virus from the surrounding skin that still looks normal. Reported recurrence after cryotherapy ranges from 16.7% to 35% across the literature. A retrospective review of 560 hand and foot wart patients found 19.6% overall, and the authors attributed it to insufficient antiviral immune effect against latent HPV even when the visible tissue had been destroyed.
That same review found something practically useful: a two-week treatment interval produced both faster cure and lower recurrence than a three-week interval, with comparable adverse events. Interval is not an administrative detail.
A wart is a viral infection wearing the costume of a blemish. Destroying the lesion does not remove the virus, which is why the recurrence figure, not the clearance figure, is the number that tells you what to expect.
The site changes the odds
In the 560-patient data, recurrence ran at 12% for warts on the feet only, 27.3% for hands only, and 31.3% in people who had both. Thickness of overlying skin, how heavily the area is used, and how much of the infected tissue a treatment can actually reach all vary by location. A treatment plan that works on a plantar wart is not automatically the plan for a periungual one.
What the immune system does unaided
Spontaneous resolution rates of 65% to 78% are reported, and roughly 40% of warts in children clear within two years with no treatment. This is not an argument for doing nothing — warts spread, they are uncomfortable on weight-bearing skin, and they can become more resistant the longer they persist. It is an argument for honesty about what treatment is buying: speed and containment, in a condition that frequently resolves on its own timeline.
It also explains why immunotherapy has grown in refractory cases. Approaches that recruit an immune response can clear warts at the treated site and at distant untreated sites, which no purely destructive method does.
Cryotherapy, honestly
Liquid nitrogen at around −196°C freezes intracellular water, forming ice crystals that rupture membranes, followed by vascular disruption and osmotic stress. It is fast, widely available and effective. It is also, in a network meta-analysis of palmoplantar wart treatments, the modality with the highest odds of recurrence and the highest adverse event rate of those compared — commonly application-site pain, erythema, oedema, blistering and occasionally ulceration.
None of that disqualifies it. It means the choice between modalities is a real clinical decision involving site, number, thickness, pain tolerance and how much downtime is acceptable, rather than a default.
Why one treatment is rarely the whole plan
Because destructive methods act on visible tissue and the infection extends beyond it, most durable results come from a course rather than a single session, at an interval chosen deliberately. The 560-patient review is the clearest evidence for that: same technique, same device, different interval, materially different recurrence.
It also explains why treatment is sometimes combined — a destructive method to reduce lesion bulk quickly, alongside something that engages an immune response against the remaining infection. Whether that is worth doing depends on how many lesions there are, how long they have been present, and whether previous treatment has already failed.
Why identification still comes first
Not everything rough and raised is a wart. Seborrhoeic keratoses, corns and calluses on weight-bearing skin, and other lesions can look similar, and treating the wrong thing with liquid nitrogen wastes time at best. The same sequence applies as with skin tags and moles: look properly, then treat.
What makes recurrence more likely
Picking or shaving over warts spreads virus. Long-standing lesions tend to be more resistant. Immunosuppression, whether from medication or illness, changes both clearance and recurrence. And stopping a course early because the visible wart has gone is a common way to end up back where you started.
References
- A Comprehensive Review of Treatment Approaches for Cutaneous and Genital Warts. PubMed Central. 2023. PMC10673707
- The efficacy of cryotherapy compared to other modalities in the management of palmoplantar warts: a systematic review and network meta-analysis. PubMed Central. PMC12264738
- Youn SH, et al. A Two-week Interval Is Better Than a Three-week Interval for Reducing the Recurrence Rate of Hand-foot Viral Warts after Cryotherapy. Annals of Dermatology. 2011;23(1):53–60. Ann Dermatol 2011
- Evolving role of immunotherapy in the treatment of refractory warts. PubMed Central. PMC5038096
- Skin Manifestations and Differential Diagnosis references. StatPearls, NCBI Bookshelf. NBK547724
If a wart has recurred after treatment, or there are several, the plan usually needs changing rather than repeating.
Book My AppointmentFrequently Asked Questions
Because destroying the lesion does not eliminate the virus in surrounding skin. Latent HPV in tissue that looked normal can produce a new wart at or near the same site. Reported recurrence after cryotherapy ranges from 16.7% to 35%, and a review of 560 patients found 19.6% overall.
Often, yes. Spontaneous resolution rates of 65% to 78% are reported, and about 40% of warts in children clear within two years untreated. Treatment is chosen for speed, spread, discomfort or site rather than because resolution is impossible without it.
The 560-patient review found recurrence of 12% for foot-only warts, 27.3% for hand-only, and 31.3% for people with both. Site, thickness of the overlying skin and how much the area is knocked or handled all affect how completely a treatment reaches infected tissue.
It is the most common, not automatically the best. A network meta-analysis of palmoplantar warts found cryotherapy had the highest odds of recurrence and the highest adverse event profile of the modalities compared. It clears effectively and quickly, which is why it remains widely used, but the trade-off is real.
Yes. Warts spread by contact, and destructive treatments can occasionally disperse virus into adjacent skin. Not picking or shaving over them, and covering them where practical, matters as much as the treatment itself.