Plantar Warts: Causes, Treatment & When to See a Podiatrist

Quick answer

A plantar wart is a virus-caused growth on the bottom of the foot. The virus is HPV, picked up through tiny breaks in the skin — usually from walking barefoot on damp public surfaces. Most go away on their own, but they can hurt and spread, so treatment is often worth it.

Important — make sure it’s actually a wart first. Several things on the bottom of the foot can look like plantar warts but aren’t: a callus, porokeratosis plantaris discreta (PPD), a foreign body (splinter, hair), a pressure ulcer hidden under thick skin, or rarely a melanoma or squamous cell carcinoma. Don’t apply salicylic acid to a lesion you haven’t had confirmed. A clinician can usually tell the difference in seconds. This matters most in people with diabetes, peripheral neuropathy, or poor circulation — get any new lesion on the sole evaluated before treating.

How to recognize one

• Small, rough, grainy patch on the sole of the foot
• Tiny black dots within the wart (clotted blood vessels — a hallmark)
• Pain when squeezed from the sides — but less when pressed straight down
• Feels like stepping on a pebble
• May be a single wart or a cluster (“mosaic warts”)
• Disrupts the normal skin lines (calluses don’t)

A callus and a plantar wart can look similar. The black dots and the side-squeeze test are the easiest way to tell them apart.

What causes it

Plantar warts are caused by the human papillomavirus (HPV) — specifically strains that target tough, hairless skin. The virus enters through:

• Tiny cracks or cuts in the skin (often invisible)
• Walking barefoot on contaminated surfaces — pool decks, locker rooms, shared showers, hotel bathrooms
• Direct contact with someone else’s wart

You can also spread your own warts to other parts of your foot by scratching or picking.

Treatment options

About 2 in 3 plantar warts resolve on their own within 2 years — the immune system eventually catches up. But waiting it out isn’t always the right call, especially if the wart is painful or growing.

Try at home first

• Salicylic acid (40% patches or 17% liquid) — apply daily for 8–12 weeks. Soak the foot first, then very gently exfoliate the surface with a pumice stone, apply, cover. The most evidence-based home treatment.
• Duct tape — covering the wart with duct tape between treatments may help (mixed evidence; safe to try)
• Don’t pick or cut — spreads the virus and risks infection

Don’t try home treatment if you have:

• Diabetes — salicylic acid can damage healthy skin and create a wound
• Peripheral neuropathy or any condition that reduces sensation in your feet — you can’t reliably tell when filing is causing damage
• Poor circulation or peripheral arterial disease — wounds are slow to heal
• A weakened immune system

See a podiatrist for in-office treatment instead.

When over-the-counter treatment isn’t enough — see a clinician

• Cryotherapy (liquid nitrogen) — done in-office, usually 3–6 sessions every 2–4 weeks
• Stronger topical agents (cantharidin, prescription-strength salicylic acid)
• Immunotherapy (squaric acid, imiquimod) — for stubborn or multiple warts
• Laser treatment — for resistant cases
• Surgical removal — last resort due to scarring risk

When to see a clinician

Same-day evaluation for:

• A wart-like lesion that is bleeding, rapidly growing, or painful out of proportion to its appearance — these features can suggest verrucous carcinoma (a slow-growing form of squamous cell carcinoma that can be mistaken for a stubborn plantar wart for months or years) or other skin malignancy
• Any signs of infection — spreading redness, warmth, pus, fever, or red streaks running up the foot
• Any foot lesion in a person with diabetes, peripheral neuropathy, peripheral arterial disease, or a weakened immune system — even if it looks “just like a wart”

Standard appointment for:

• Confirming the diagnosis before starting any treatment
• Pain that limits walking or activity
• A wart that is growing or new lesions appearing
• No improvement after 2–3 months of home treatment
• Multiple warts or recurrent warts

Prevention

• Wear shower sandals in public locker rooms, pools, gyms, hotel bathrooms
• Don’t share towels, socks, or shoes
• Keep feet dry — change wet socks
• Don’t touch other people’s warts (or your own with bare hands)
• Cover existing warts with a bandage when going to the pool or gym to reduce spread