How to Get Rid of a Verruca: Treatments & Prevention

Most verrucas respond to persistent at-home treatment with salicylic acid or in-clinic freezing with liquid nitrogen, though neither method clears them quickly or reliably in every case. Verrucas are plantar warts caused by human papillomavirus (HPV) infecting the thick skin on the sole of the foot, and getting rid of them often takes weeks to months of repeated effort. The strain of HPV involved, the depth of the lesion, and your immune system’s ability to recognize and fight the virus all shape how stubborn a particular verruca turns out to be.

What You Are Actually Dealing With

A verruca is a wart on the sole of the foot, pushed flat by body weight so it grows inward rather than outward. It is caused by HPV, a DNA virus that needs a break in the skin and a momentary dip in local immune defense to take hold in a skin cell.¹ The strains responsible for plantar warts are different from those linked to cervical cancer or genital warts. HPV type 1 is the most common culprit, found in over a third of cases in one large study, though types 2, 27, and 57 also show up frequently.² This matters because, as covered below, the strain has a real effect on whether a verruca clears on its own and how it responds to treatment.

Salicylic Acid and Cryotherapy Are Equally Effective

The two treatments you will encounter first are over-the-counter salicylic acid and in-clinic cryotherapy (freezing with liquid nitrogen). A common misconception is that freezing is the more powerful option because it requires a medical visit. In reality, multiple trials have found no meaningful difference between the two for plantar warts. A randomized controlled trial comparing the two approaches found identical clearance rates at 12 weeks, with about 14% of participants in each group achieving complete resolution.³ A separate trial reached the same conclusion, finding no clinically relevant difference between cryotherapy, salicylic acid, or even a wait-and-see approach after 13 weeks.⁴ A 2023 meta-analysis pooling data across trials confirmed this, showing no statistically significant difference in complete clearance at 12 weeks.⁵

Those 14% clearance rates at 12 weeks sound discouraging, but they reflect a strict measure of complete clearance of all warts in the study window. In broader clinical experience, topical salicylic acid solutions are estimated to clear warts in roughly 60 to 80% of cases over 12 weeks, and higher-concentration formulations may work faster.⁶ The key with salicylic acid is daily consistency. You soak the foot, file down the dead skin, apply the acid, and cover it. Miss days and you lose progress. Most people who fail with salicylic acid failed with adherence, not with the treatment itself.

Cryotherapy typically involves multiple clinic visits spaced two to three weeks apart. It hurts during application and sometimes causes blistering afterward. For plantar warts specifically, one trial found that an office-applied acid called monochloroacetic acid offered comparable effectiveness to cryotherapy with less pain during the procedure, making it a reasonable alternative if your clinic offers it.⁷

Why the Virus Strain Changes Everything

One of the least appreciated factors in verruca treatment is the specific HPV type causing yours. A secondary analysis of a large randomized trial found dramatically different outcomes depending on strain. HPV type 1 plantar warts cleared spontaneously in about 58% of cases with no treatment at all, and responded well to both salicylic acid and cryotherapy. But plantar warts caused by HPV types 2, 27, and 57 barely budged without treatment, with only about 7% clearing spontaneously. Cryotherapy performed poorly against those strains too, clearing only about 11%, while salicylic acid managed about 25%.⁸

You cannot tell which strain you have by looking at the verruca, and routine HPV typing is not standard practice for plantar warts. But the practical takeaway is important: if your verruca has not responded to months of diligent treatment, it may not be your fault or your technique. The virus strain may simply be one that resists first-line approaches, and escalating to a different method is reasonable.

A separate study confirmed that HPV type 1 verrucas were more likely to both cure and recur, while types like HPV 5 and HPV 27 took far longer to heal.² So if you have had a verruca that vanished and then came back, you may actually be dealing with the “easier” strain. Cold comfort, perhaps, but it explains the pattern.

Microwave Therapy

A newer clinic-based option that has gained traction is microwave therapy, delivered by a device called Swift. It works by heating tissue to create localized hyperthermia, which is thought to trigger an immune response against the virus. A study of 150 plantar warts treated with microwave therapy found that about 83% resolved, with an average of roughly three treatment sessions needed.⁹ Younger patients tended to respond better.

Those numbers come from an uncontrolled study, though, meaning there was no comparison group. When microwave therapy was tested against a sham treatment in a randomized controlled trial, the clearance rate was lower: about 27% of the treatment group achieved complete clearance compared to 0% in the placebo group, a statistically significant difference but more modest than the uncontrolled data suggested. Just over half of treated patients saw partial clearance.¹⁰ The patients in that trial had warts that had already resisted other treatments, which likely explains the lower success rate. Microwave therapy is not painless either; the average pain score during treatment sat around 5.4 out of 10 in that trial.

Pulsed dye laser is another clinic option, though it is less commonly offered for plantar warts specifically. It works by destroying the tiny blood vessels that feed the wart, starving the infected tissue of nutrients.¹¹ It tends to be reserved for cases that have not responded to simpler methods.

Immunotherapy for Stubborn Cases

Since clearing a verruca ultimately depends on your immune system recognizing and attacking HPV-infected cells, some treatments aim to provoke that immune response directly. Intralesional immunotherapy involves injecting an antigen, often derived from Candida (yeast) or mumps, directly into the wart. The idea is that the injection causes a strong local immune reaction, and in the process the immune system “notices” the HPV-infected cells nearby.

A two-year clinical study at a major medical center treated 100 patients with Candida antigen injections and found that 80% responded: about 39% had complete clearance and 41% had partial clearance.¹² One appealing feature of immunotherapy is that when it works, it can clear warts at distant sites too, not just the injected one, because the immune activation is systemic. This approach tends to be offered by dermatologists for warts that have failed multiple rounds of conventional treatment.

The Duct Tape Question

Duct tape occlusion is one of those treatments that sounds absurd but has been studied in actual clinical trials. The original study that put it on the map found that 85% of patients in the duct tape group had complete resolution of their warts, compared to 60% with cryotherapy.¹³ That study was in a mostly pediatric population and got enormous media attention.

Subsequent research, however, has cooled the enthusiasm. A double-blind trial in adults found low success rates in both the duct tape and control groups, suggesting that occlusion by itself is not the active mechanism. Several theories have been proposed for how duct tape might work: depriving the virus of oxygen, mechanically debriding the wart during tape changes, creating a moist environment that stimulates immune activity, or even a placebo effect that may be stronger in children than adults.¹⁴ If you want to try it, the usual protocol is to cover the verruca with a small piece of duct tape for six days, then soak and file the area, leave it uncovered overnight, and reapply the next morning. It is cheap and low-risk, but the evidence for adults is thin.

Formic Acid and Other Topical Options

Formic acid is available in some countries as an over-the-counter or pharmacy treatment for warts. A trial using 85% formic acid applied with a puncture technique found that 92% of treated patients had complete disappearance of their warts after three to four weeks, compared to 6% in the placebo group.¹⁵ A separate head-to-head comparison found a lower complete cure rate for formic acid of about 32%, with a burning sensation reported by roughly a quarter of patients in that group.¹⁶ The wide gap between those two studies likely reflects differences in technique, concentration, and patient populations. Formic acid is worth knowing about as an alternative, but the evidence base is less consistent than it is for salicylic acid.

Electrosurgery and Surgical Removal

For warts that have resisted everything else, physical destruction through electrosurgery or surgical excision is an option, though typically a last resort for plantar warts because of the healing time required on a weight-bearing surface. A systematic review found that electrosurgery achieved cure rates up to 100% with a recurrence rate of about 15% over one year.¹⁷ That review focused on anogenital warts rather than plantar warts specifically, so the numbers should not be applied directly to verrucas, but the principle is the same: physical destruction of the tissue eliminates the visible lesion. The virus can still persist in surrounding skin cells, which is why recurrence is always a possibility even after surgical methods.

Why Your Immune System Is the Real Treatment

Every treatment method described above is really just buying time or creating conditions for your immune system to do the actual work. The virus hides inside skin cells and does not trigger a strong systemic alarm the way a blood-borne infection would. Clearance happens when immune cells, particularly certain T cells, recognize HPV-infected tissue and destroy it. This immune response involves inflammatory signaling molecules that activate macrophages and cytotoxic cells to target the infected area.¹⁸

This explains why children clear warts more readily than adults (their immune systems are encountering HPV strains for the first time and mounting vigorous responses) and why immunocompromised individuals can develop extensive, painful warts that resist treatment.¹⁹ Patients with extensive or treatment-resistant warts may have an underlying immune impairment that makes them more susceptible to HPV persistence.²⁰ People on immunosuppressive medications, such as organ transplant recipients, are particularly vulnerable to recalcitrant warts that often respond poorly to conventional treatments.²¹

If you have had verrucas for years despite treatment, or if they keep multiplying, it is worth mentioning to your doctor. In most people this is just bad luck and a sluggish local immune response, but in a small number of cases it can point to an immune issue worth investigating.

How to Prevent Verrucas

HPV thrives in warm, damp environments where people walk barefoot. A study of communal shower use found that 27% of people who used shared shower rooms had plantar warts, compared to just 1.25% of those who used only locker rooms.²² That is a stark difference, and it points to the single most effective prevention strategy: wear flip-flops or waterproof sandals in shared showers, pool surrounds, and gym changing areas.

Beyond footwear in wet public spaces, keeping the skin on your feet in good condition matters. Cracked, macerated, or abraded skin provides the entry point HPV needs. Drying your feet thoroughly after bathing and managing any existing cuts or cracks on the soles reduces your exposure. If you already have a verruca, avoid picking at it or using the same pumice stone on healthy skin, as this can spread the virus to new sites on your own feet or hands.

A question that comes up often is whether the HPV vaccine helps with plantar warts. The vaccines currently available target the high-risk strains responsible for cervical and other cancers, plus a few strains causing genital warts. A study of pediatric patients found no significant relationship between HPV vaccination status and whether warts resolved.²³ The vaccine is not designed to target the low-risk cutaneous strains (like HPV 1, 2, and 57) that cause plantar warts, so there is no reason to expect it to prevent or treat verrucas.

A Practical Treatment Ladder

Knowing all these options is useful, but what most people want is a clear sequence. Here is a reasonable approach, roughly ordered from least invasive to most:

• Start with salicylic acid: Available over the counter in concentrations from about 15 to 40%. Apply daily after soaking and filing. Give it a full 12 weeks before deciding it has failed. Consistency matters more than concentration.
• Try cryotherapy if you prefer clinic visits: It is not more effective than salicylic acid for plantar warts, but some people prefer a professional doing the work. Expect multiple sessions.
• Consider microwave therapy: If your clinic offers Swift treatment, it is worth trying for verrucas that have not responded to first-line options. Usually three to four sessions spaced a month apart.
• Ask about immunotherapy: For persistent verrucas, intralesional Candida or mumps antigen injections can provoke the immune system into clearing the virus. This requires a dermatologist.
• Surgical options as a last resort: Electrosurgery or excision can physically remove the wart, but healing on the sole of the foot is slow and scarring can itself be painful on a weight-bearing surface.

Throughout all of this, patience is non-negotiable. Verrucas are not dangerous, and many eventually clear without treatment at all, though that can take years. The treatments shorten the timeline and reduce the risk of spreading the virus, but none of them work overnight. If you have been treating a verruca faithfully for three months with no improvement, switching methods rather than continuing the same failing approach is the pragmatic move.