Saltwater Cleared 98% of Stubborn Plantar Warts: Here’s What the Study Actually Shows

Welcome to Journal Club, where I read dermatology research papers so you don’t have to. For the first installment, we are covering a study from the Journal of the American Academy of Dermatology that found soaking your feet in salt water cleared 98% of stubborn plantar warts. No freezing, no acid, no pain.

That is a remarkable result. I read the full paper, and here is an honest breakdown: what the researchers actually did, why the result is worth taking seriously, what the limitations are, and how I would try it at home.

Why Plantar Warts Are So Hard to Treat

Plantar warts are warts on the bottom of the foot, caused by a virus called HPV. They are some of the hardest warts on the body to clear. Even first-line treatments (cryotherapy and salicylic acid) achieve cure rates of only around 14 to 46% for plantar warts specifically.

Three reasons they’re so stubborn.

First, they burrow deep into thick skin. The bottom surface of your foot has the thickest skin on your body. These warts tend to grow inward, pushing deeper rather than growing outward. Salicylic acid has a hard time penetrating deeply enough to effectively treat plantar warts. Cryotherapy (in-office freezing) has a hard time reaching the base of the wart.

Second, the virus hides in surrounding skin. Standard treatments target the visible wart, but HPV is often sitting invisibly in the skin right around it. You clear the visible bump; the virus comes back from the invisible remnants. That’s why so many of these warts come back.

Third, HPV hides from the immune system. This is the biggest obstacle. Many viruses cause inflammation when they infect cells, which signals the immune system to respond. HPV does the opposite. It sneaks in like a ninja, suppresses local immune defenses, and never triggers your immune system’s alarms. Your body simply doesn’t realize that it should fight this invader because it’s hidden. Warts can linger for years because of this, not because your immune system is weak but because the virus is actively hiding from it.

What the Study Found

Xu et al. enrolled 17 adults with plantar warts that had already failed standard treatment. Every participant soaked the affected foot in saturated salt water for 30 minutes a day for 8 weeks. Saturated means the water has dissolved as much salt as it physically can, with a little settling at the bottom.

The results:

• 98.3% of individual wart lesions cleared (232 out of 236)
• 88.2% of patients had complete clearance of every wart (15 out of 17)
• Zero recurrences at 6-month follow-up

For context: these were warts that had already failed other treatments. They had already survived cryotherapy and salicylic acid. A 98% clearance rate with no recurrences at six months is an incredible outcome for this population.

The Limitations (Read This Part)

No control group. Everyone in the study got the salt water. Nobody soaked in plain water for comparison. In principle, a salt soak is a bundle of things: osmotic pressure, daily softening of dead skin, and a consistent ritual you’re invested in. Without a comparison arm, you can’t perfectly isolate the salt as the cause.

That said, this limitation doesn’t mean plain water would produce the same result. Salt creates a specific osmotic environment that plain water simply does not (more on this below). The biology of what osmotic stress does to HPV-infected cells is specific, not generic. There is also indirect clinical support: a 2026 meta-analysis ranked intralesional saline as the top treatment modality for wart clearance across all options tested. The gap in this study is about confirmation, not credibility.

Small sample. 17 patients is a small number. 236 lesions adds reassurance, but this needs replication in larger trials before we can draw firm conclusions.

Adults only, single clinic. No children were included. Practically speaking, keeping a child’s foot still in water for 30 minutes every day for 8 weeks is a real challenge. The study was also conducted at a single center.

Plantar warts only. This is important. The study looked specifically at warts on the bottom of the foot, which sits beneath the thickest skin in the body. Palmar warts on the hands are on similarly tough skin, so trying this there is a more reasonable extrapolation. But warts on thinner or more sensitive skin are a different situation entirely. We can’t assume this protocol applies everywhere.

How It Might Work

Here is the proposed mechanism, and it’s more interesting than “salt kills things.”

Salt solution pulls water out of cells by osmosis, causing them to shrink. That shrinkage is not just passive. It triggers an active chain of stress signals inside the cell that push it toward self-destruction. Normal skin cells are better at weathering this type of stress.

HPV-infected cells are in a more precarious position. When HPV takes over a cell, it forces that cell to keep dividing nonstop by switching off the normal stop signals.

Think of it like a zombie: instead of eating brains, it just keeps making more cells.

This constant drive to divide creates an ongoing internal pressure toward self-destruction that the virus has to actively suppress just to keep the infected cell alive. One of the virus’s own proteins, E5, also weakens the cell’s outer envelope specifically to osmotic stress.

So when salt water arrives, it attacks the survival pathways the infected cell is dependant on. The balance tips, and the infected cell buckles first, while healthy cells around it, not running that same precarious balancing act, are able to survive.

There are other proposed mechanisms like this one: the chloride in salt appears to cause cells to produce hypochlorous acid, a natural antimicrobial that your immune cells use when fighting infection. This can also impair viral replication.

This framework comes from lab and cell studies, not these 17 patients. It’s not proven in this context, but it’s not magical thinking either. There are specific, documented biological reasons salt might do what the study suggests.

The Protocol

Based on the study:

1. Fill a basin with enough water to cover the wart completely
2. Stir in table salt until no more will dissolve and a little settles on the bottom
3. Soak the affected foot for 30 minutes daily
4. Dry thoroughly afterward, especially between the toes

Note: the study doesn’t specify water temperature. Avoid very hot water, which increases the risk of skin breakdown.

Stick with it for the full 8 weeks assuming you don’t see negative changes in your skin after starting treatment. Improvement with warts is rarely linear. The pattern is usually no change, no change, no change, then a significant drop in the number of size of your warts. The plateau is the doubt stage.

If the protocol is going to work, it tends to work in a jump, not a gradual decline.

Who Should Not Try This

Talk to your doctor before starting if you have:

• Diabetes, peripheral neuropathy, or poor circulation
• A weakened immune system (including solid organ transplant recipients, people taking medications that suppress their immune system)
• Active rashes, open sores, or skin infections other than warts on the feet
• Peripheral vascular disease

Daily 30-minute soaks can macerate skin, making it soft and prone to breakdown. That is a setup for fungal and bacterial infection, particularly in anyone with a compromised immune system, abnormal circulation, or reduced sensation in the feet.

If I were trying it: I’d dry between my toes carefully after every soak, monitor the surrounding skin carefully during these 8 weeks, and stop if I start to notice cracking, redness, or signs of infection.

Are You Sure It Is a Wart?

Before treating anything yourself, make sure you know what you’re treating.

Patients have come to me with a confident self-diagnosis of plantar warts and required a different diagnosis after examination. A few memorable ones: pyogenic granulomas, which are small pink or red vascular growths; amelanotic melanoma, the skin-colored or pink variety of melanoma that is easy to overlook; and verrucous carcinoma, a low-grade skin cancer that can look strikingly similar to a wart.

If you’re not sure what you’re treating, see a dermatologist before starting any treatment.

The Bottom Line

This is a promising study in a population where existing treatments routinely fail. The mechanism is biologically specific. The effect size is too large to dismiss. And the treatment costs almost nothing.

It’s also a single study on 17 patients with no control arm. It needs replication. My take is that this looks worth trying for healthy adults with plantar warts that failed standard treatments, with the right safety precautions, while we wait for better evidence.