Painful Bumps on Your Feet? The Sneaky Plantar Wart Symptoms Most People Miss
A doctor reveals what causes them and how to tell them apart from calluses
Noticed a painful bump on the bottom of your foot that won’t go away? It might be a plantar wart—and unlike other warts, these stubborn growths burrow deep beneath the skin’s surface. Keep reading as a leading podiatrist shares the plantar wart symptoms you shouldn’t ignore and exactly how to differentiate them from calluses.
What is a plantar wart?
Warts can appear on any part of the body, but when they show up on the bottom of the foot, they’re called plantar warts. If you picture a cartoon witch with a wart on her nose, you probably imagine a raised, bubble-like bump. On the bottom of the foot, however, things look different, says Ryan P. Minara, DPM, Chief of Podiatric Medicine and Surgery, Division of Orthopedics, Mount Sinai Health System.
“Because the skin there is thicker—and because we walk on it—that ‘bubble’ is often pushed inward,” he notes. “That’s why while warts elsewhere on the body might appear more bulbous or bubble-like, plantar warts sometimes appear flatter. Even if the overall size seems similar, more of the wart is deeper in the skin than protruding out of it.”
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A virus causes these warts, specifically the human papillomavirus (HPV), which typically enters through tiny cuts or cracks in the skin.
3 common plantar wart symptoms
A few telltale symptoms of plantar warts to watch for:
They go deeper than you think
Plantar warts frequently have what Dr. Minara calls the “ iceberg effect.” “There is often much more wart tissue beneath the surface than what you can see,” he explains. “What’s visible on top may be just a small portion of the overall lesion.
They also develop root-like projections called papillae that extend deep into the skin. While the warts themselves live in the outermost skin layer, these “roots” push down into the layer below—which is why they can be stubborn to treat.
They may masquerade as calluses
At first glance, a plantar wart may simply look like a callus—an area of thickened, hardened skin, notes Dr. Minara. But on closer inspection, you’ll often notice small black or reddish pinpoint dots, a cauliflower-like surface and most importantly, an interruption of the normal skin lines, the same lines that form your fingerprints.
A regular callus will have skin lines that continue smoothly across it, he explains. A plantar wart, on the other hand, disrupts those lines. As warts grow, they develop their own tiny blood vessels to nourish themselves—those are the pinpoint black or red dots you see.
Even so, sometimes it’s difficult to distinguish plantar wart symptoms from a callus until a medical professional carefully debrides (removes the top layers of) the lesion to see what lies underneath, Dr. Minara points out. “Again, because of that ‘iceberg effect,’ there is often far more wart tissue below the surface than you might expect.”
One helpful clue: “Calluses typically hurt more with direct downward pressure, while warts often hurt more when squeezed from side to side,” he says. “Though this isn’t foolproof, it can help us differentiate between them, especially in early or smaller lesions.”
They can take on a variety of shapes and sizes
Some warts appear as single, standalone growths, while others develop in clusters, says Dr. Minara. “There are also mosaic warts, which form a flatter, patch-like pattern across a larger area of the sole.” In short, the size of plantar warts can vary significantly.
The most surefire way to get a fast and accurate diagnosis? Visit your doctor, who can also recommend over-the-counter and prescription options to treat plantar warts.
Health conditions that raise the risk of plantar warts
Like many viral infections, anyone can get HPV, but people with weakened immune systems are more susceptible, notes Dr. Minara, who reveals several conditions that increase the risk of developing plantar warts:
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- Diabetes
- HIV/AIDS
- Certain cancers (especially when people undergo treatments)
- Autoimmune illnesses
“Even temporary factors, like stress or battling another illness like the flu, can make it easier for the virus to take hold,” he adds. “In addition, children and teenagers—roughly ages 5 to 18—tend to have a higher incidence.”
The single biggest cause of plantar warts
That said, Dr. Minara notes that the top culprit for contracting a plantar wart is the environment. “The virus that causes plantar warts thrives in warm, moist communal spaces. Think public pools, saunas, yoga studios or any gym floor that people walk on barefoot. Gym showers, public showers and hotel rooms can also be prime spots for wart transmission.”
Of course, not everyone who takes a hot yoga class barefoot develops warts, but it’s important to take precautions in these environments. “When possible, I recommend wearing grip socks if allowed,” advises Dr. Minara. “Change them immediately after class, and try to avoid walking barefoot in the locker room or shower areas.”
Another smart way to help prevent plantar warts? If you shower at the gym, it’s a good idea to wear water shoes that you can easily clean afterward.
And if you’re immunocompromised or have a history of warts, take extra care during and after potential exposure, cautions Dr. Minara. “Any cuts, scrapes or cracks in the skin can make you more susceptible, so take extra precautions in those cases.”
Good news for pedicure fans: While nail salons used to be a common source of HPV and fungal infections, most pedicure places now use disposable plastic liners in their soaking tubs, which has helped dramatically reduce infection rates.
The bottom line on plantar wart symptoms
Though they can be stubborn, learning to recognize the symptoms of plantar warts and understanding your risk factors will help you know when to visit your doctor and start treatments that speed relief.
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