Doctors remove plantar warts using several methods, from freezing and blistering agents to laser therapy and minor surgery. The right approach depends on the size, number, and stubbornness of your warts, and many cases require multiple treatment sessions before the wart fully clears. Here’s what each option involves and what to expect.
Cryotherapy (Freezing)
Cryotherapy is the most common in-office treatment for plantar warts. Your doctor applies liquid nitrogen, which has a boiling point of negative 320°F, directly to the wart using a spray device or a cotton-tipped applicator. The extreme cold destroys the infected tissue and triggers your immune system to respond to the virus underneath.
Each freeze lasts 10 to 60 seconds, and your doctor may repeat the cycle once or twice in the same visit. The freezing starts once a visible white ice ball forms on the skin’s surface. You’ll feel a burning or stinging sensation during the freeze, and within a day or two, a blister typically forms around the wart. That blister lifts the wart tissue away from the healthy skin beneath it. Over the following week, the dead tissue dries up and can be trimmed at a follow-up visit.
Most plantar warts need multiple cryotherapy sessions spaced two to three weeks apart. Stubborn or deep warts can take several months of repeat treatments. The procedure is painful on the sole of the foot, where skin is thick and nerve-rich, so some doctors will numb the area beforehand.
Blistering Medicine (Cantharidin)
Cantharidin is a chemical your doctor paints directly onto the wart during an office visit. It’s painless at the time of application because it doesn’t damage nerve endings on contact. Instead, it seeps under the wart and causes a blister to form over the next several hours. The blister separates the wart from the skin beneath it. About a week later, you return to the clinic so your doctor can clip away the dead wart tissue.
This method works well for children or anyone who wants to avoid the pain of freezing. Some warts need more than one round of cantharidin, and your doctor may combine it with salicylic acid to improve results.
Prescription-Strength Salicylic Acid
Over-the-counter wart removers contain salicylic acid, but the concentrations doctors use are significantly stronger. Pharmacy products typically top out around 17% to 27%, while prescription formulations for plantar warts can reach 25% to 60% in ointment form. At these higher concentrations, your doctor applies the acid in the office and may ask you to continue a lower-strength version at home between visits.
Salicylic acid works by dissolving the wart layer by layer. You soak the foot, file down the dead skin, and reapply. It’s a slow process, often taking weeks to months, but it’s one of the best-studied treatments and works well when combined with other methods like cryotherapy.
Laser Treatment
When warts resist standard treatments, doctors sometimes turn to laser therapy. A pulsed dye laser targets the tiny blood vessels that feed the wart, heating the blood inside them until the vessels collapse. Without a blood supply, the wart tissue dies. Published cure rates for this laser range from 48% to 95%, with the wide range reflecting differences in wart severity and the number of sessions used.
Laser treatment is typically reserved for warts that haven’t responded to freezing or salicylic acid. Each session takes a few minutes, and you may need two to four treatments spaced several weeks apart. The treated area can be sore for a few days afterward, similar to a deep bruise on the sole of the foot.
Electrosurgery and Scraping
For warts that won’t budge with less invasive methods, your doctor may physically remove the wart using an electric needle and a scraping instrument called a curette. The area is numbed first with a local anesthetic injected around the wart. Then the doctor uses a small electrical device to heat and destroy the wart tissue in thin layers, scraping away the debris as they go. This is a partial-thickness removal, meaning the doctor takes only the affected layers of skin rather than cutting deep into the foot.
The advantage is that the wart is gone in one visit. The downside is a wound on the bottom of your foot that takes a few weeks to heal, and walking can be uncomfortable during recovery. This method can also leave a small scar, which is why most doctors try less invasive approaches first.
Immunotherapy Injections
This approach works differently from every other option on this list. Instead of destroying the wart directly, your doctor injects a substance into the wart that wakes up your immune system and forces it to recognize the virus it’s been ignoring.
One common version uses a small amount of Candida antigen, a protein derived from yeast that most people’s immune systems already recognize. Injected into the wart, it triggers an inflammatory response. Immune cells, particularly certain types of white blood cells, flood the area and begin attacking not only the injected antigen but the wart virus as well. This makes immunotherapy especially useful if you have multiple warts, because treating one can sometimes cause others to clear on their own.
Sessions are typically repeated every two to three weeks. The injection itself stings, and the wart site may become red and swollen for a day or two as your immune system ramps up.
Microwave Therapy
A newer option called Swift therapy delivers focused microwave energy directly into the wart. Each pulse lasts only one to two seconds, and no numbing is needed beforehand. The microwave energy heats the water molecules in the infected tissue, which creates a signal that draws immune cells to the area.
Most people need three to four sessions spaced about three to four weeks apart, though smaller warts may clear faster. There’s no wound to care for afterward since the skin isn’t broken. You can walk normally right after treatment. The main sensation during the pulse is a brief, sharp pain that fades within seconds.
Bleomycin Injections
For the most resistant plantar warts, some dermatologists inject a chemotherapy agent called bleomycin directly into the wart. Used at tiny doses and only at the wart site, it kills the rapidly dividing infected cells. A black scab forms over the wart and eventually falls off as healthy skin grows in underneath.
The most common side effect is pain at the injection site, which can be significant on the sole of the foot. In rare cases, bleomycin injections have been associated with loss of pigment in the treated skin, scarring, or restricted nail growth if used near a toenail. This is a last-resort treatment, reserved for warts that have failed multiple other approaches.
What Affects Your Doctor’s Choice
Your doctor considers several factors when recommending a treatment: how long you’ve had the wart, how many warts you have, whether you’ve already tried over-the-counter treatments, and where exactly on the sole the wart sits. Warts on weight-bearing areas like the heel or ball of the foot are trickier because any treatment that creates a wound makes walking painful during recovery.
Most doctors start with the least invasive options, typically cryotherapy or prescription salicylic acid, and escalate to laser, surgery, or injections only if those fail. Combination therapy, using two methods at once, often works better than any single treatment alone. Plantar warts are notoriously persistent because the virus hides in the thick skin of the sole, so expect the process to take weeks to months regardless of the method used.