“I keep coming back, and this wart still won't clear up.” Here's why
“I'm paying for this, and it's still there”
This piece came out of a run-in I had in my office. A patient came in for another session and got upset with me: he'd been dealing with this plantar wart for a while, this wasn't his first visit, he was paying good money for it — so where was the result?
I get the frustration. But the treatment isn't failing — the real issue is that plantar warts aren't all the same, and different kinds need genuinely different approaches. That's what this article is about, so you know from the outset what you're dealing with.
Type one: myrmecia — deep and painful, but quick to clear
Myrmecia is a single, ordinary wart. It can show up anywhere on the sole. It runs deep and builds up a thick layer of hardened skin (hyperkeratosis), which causes pain and tenderness — walking gets uncomfortable.
It looks worse than it is: this type clears up fast. We debride the wart, then treat it with acid, freezing, or microcurrent. At home the patient uses specific AHA acids and zinc, and the skin bounces back quickly. In practice, one or two sessions is usually all it takes.
Photos: myrmecia at the first visit, before and after treatment — and the same spot at the second visit, the final session, wart gone.
Type two: mosaic warts — the ones that cause the arguments
A mosaic wart is a different animal entirely. It's not one wart but a cluster of small ones grown together, like tiles in a mosaic. It can sit with someone for years — left untreated, it can honestly stay for life.
It lives strictly in the stratum lucidum, the skin's clear layer — and that's exactly why it's so hard to shift.
The skin on the sole has five layers: basal, spinous, granular, lucidum, and corneum. The corneum on top is made entirely of dead cells doing their last job before they shed. Right under it, the lucidum layer is transitional — its cells are on their way out but still alive, still fed by nutrients and tiny blood vessels. It's translucent, but it's also the toughest layer of all: it binds the skin together and locks in moisture.
For a wart, that's the perfect hideout. The layer acts like armor — the wart can't push any deeper than it. It never reaches nerve endings or Merkel cells, so it simply doesn't hurt: people just live with it, apart from how it looks and how it feels to the touch. That's also why it's flat and mosaic-shaped rather than raised. It survives off the same nutrients and microvessels still present in that layer. No pain, no trouble walking — which is exactly why it can hang around for years.
Why it fights back
A mosaic wart defends itself, and it does it cleverly. Debride it and apply acid or freezing, and the wart essentially passes that damage straight through to the healthy cells underneath. In that moment it behaves like a frying pan — it dies, but it conducts the burn, chemical or thermal, deeper into the tissue. The healthy cells around it get injured, and a closed internal wound forms, like a bruise under the skin. That brings on a burning pain — sometimes bad enough that the person can't put weight on the foot the next day.
And that pain does its own kind of damage: people get scared, decide it's better left alone since it's "just a wart" and doesn't stop them from living their life. So it stays.
How long a mosaic wart actually takes
In my experience, never in one go. Two, three, four months — my longest case ran to six. But it does clear. We work it out of the lucidum layer gradually, with the same methods used for myrmecia. The difference isn't the method — it's the timeline. It's a process you have to stick with, whether you feel like it or not.
Over-the-counter pain relievers can take the edge off at home during this stretch.
What I tell every patient at the first visit
At the first visit we always diagnose the type of wart, explain exactly what it is and how we'll treat it — and we always warn people about what's coming.
Here's what's coming: literally the day after the first session, inflammation can flare up badly enough that you can't put weight on your foot. A deep blister forms under the skin, filled with fluid and blood. That's just the body defending itself against the injury — blood rushes to the site and new tissue starts forming. But while that fluid is building up, the pressure under the skin climbs, and it can hurt even when you're not putting any weight on it at all.
This is a normal part of the process, not a complication. When it happens, the patient comes in right away the next day. We open the blister, release the pressure, and apply medication — the relief is almost instant, and the person walks out comfortably on their own two feet.
In fact, that reaction is a good sign: it means we've hit the wart, and recovery is starting.
The key thing to understand: it's a virus, not a "root"
People often picture a wart like a root buried in the skin — pull it out, and it's gone. That's not how it works. A wart is a viral infection, and it's the virus that has to be treated.
Plantar warts come from the human papillomavirus (HPV), which gets in through tiny cracks and micro-injuries in the skin — and on a foot that's under load all day, there's no shortage of those. The virus takes over skin cells and drives them to multiply out of control, which is what grows into a wart.
Different HPV strains cause different kinds of warts: myrmecia comes from HPV type 1, mosaic warts from types 27 and 57 — which is why they behave so differently and take such different amounts of time to treat.
That's why "cut it out and move on" doesn't really work: as long as the virus is still in the skin cells, the wart can come back. Treatment is a step-by-step process of destroying the infected cells and giving the body a chance to clear the virus.
So my honest answer to "why does this take so long and cost so much" is simple: don't go in expecting a wart gone in one visit, mosaic or myrmecia. It's a viral infection, and it has to be treated like one — the timeline depends entirely on which type you actually have. That's exactly why diagnosis at the first visit isn't a box to tick; it's what tells you how long you're in for.
A real case: both types of wart, one patient
A patient came to me with both types at once: several myrmecia across both heels, plus one mosaic wart on the underside of the right heel. There was no way to tell them apart before debriding — the diagnosis only became clear once we started treatment. The whole course took four visits: July 18, August 5, August 19, and August 29, 2026. By the end, every wart — myrmecia and mosaic alike — was gone.
First visit
She came in with multiple painful plantar warts on both heels — two on one, three on the other — that had been bothering her for about six years, hurting when she walked or when pressure was applied.
Before seeing me, she'd spent a year at another clinic getting debridement and nitrogen cryotherapy, and had also seen dermatologists who prescribed topical treatments. Neither helped; her last attempt at treatment had been about a year earlier. On the side, she's into swimming and dancing.
On examination I found five lesions on the heels of both feet, each capped with thick hyperkeratosis, sitting right where the pressure is heaviest when walking. There was no way to tell the wart type under all that thickened skin by eye — that only became clear once I debrided them. In the end, four turned out to be myrmecia, and one — on the underside of the right heel — was a mosaic wart.
During that visit I mechanically cleared the hyperkeratosis down to where the capillaries in the papillary dermis start to bleed — that's the "black dots" you sometimes hear about — then applied an acid compound to all the lesions to destroy the tissue chemically. I covered everything with an aseptic dressing and taped it down.
For home care I prescribed an ointment: apply it precisely to each wart twice a day, morning and evening, after washing the feet, and cover it with gauze and tape each time. I told her specifically not to get her feet wet for 24 hours so the acid keeps working, and to wear shoes and socks a size up so nothing presses on the foot. If the pain was significant the next day, she was to call the clinic right away for an antibiotic dressing change. Even at this first visit, I told her that once everything cleared, she should get into the habit of using a protective foot cream regularly.
Second visit
By the second visit (August 5), the difference was already obvious. The myrmecia had gone from raised bumps to flat, blister-like patches. That's the treatment breaking down the infected tissue while the body regenerates new cells at the same time: infected cells get pushed out, and the tiny blood vessels feeding them shut down — which is exactly why the lesion flattens out.
The mosaic wart behaved differently — still about the same size and still noticeably raised, just as it had been at the first visit, only slightly smaller.
Debriding the myrmecia this time left almost nothing — one or two small "papillae" at most, which was a good sign for both of us: the virus was nearly beaten. The mosaic wart, on the other hand, debrided the same as it had the first time.
Third visit
By the third visit (August 19), both types were still present on the right heel. Of the myrmecia, literally one papilla remained — but I never eyeball it and call it done: leave even a trace, and there's a real risk it grows back, so I work it all the way through. The mosaic wart gets different treatment: I debride deeper, right down to the root, until the skin underneath is completely clear — it sits tighter in the skin and needs more thorough work.
On the left foot, things were looking much better: one of the two warts had cleared entirely, and the other, on the inner side of the foot, had shrunk to almost nothing. That's a good sign the treatment is on track.
At every visit I reminded her that mosaic warts usually take longer than myrmecia. But since hers was visibly and steadily shrinking, that was a good sign we were heading the right way.
After the first visit she had pain for about a day and some burning around the treated areas. After the second and third, the symptoms were similar but milder — nothing severe. After the fourth and final visit, the pain lasted four days and then cleared completely.
Last visit
By the last visit (August 29), she came in with no pain and no discomfort at all. Where the warts used to be, only small patches of skin remained, and those had almost fully peeled away on their own.
All that was left for me to do was clean up those last patches of skin and apply the same zinc-and-AHA product as before. For home care I prescribed a foam to use every morning, and since she's active in sports, a protective spray to apply before training.
What's worth taking away from this
This particular case — clearing two different types of plantar wart at once — went fast: two months, start to finish. But that's far from the norm, and it would be a mistake to treat one good outcome as a promise that everyone's experience will look the same.
A wart is a virus, and how quickly you get rid of one depends on your immune system, how careful you are with hygiene, and honestly, your own attitude toward dealing with it — toward the virus itself, and toward the fact that you have it.
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