Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.

What Are Plantar Warts?

Plantar warts (verruca plantaris) are skin growths caused by human papillomavirus (HPV) infection — specifically HPV types 1, 2, 4, 60, and 63. The virus infects the outermost layer of skin through small breaks or cuts, typically acquired by walking barefoot on surfaces where the virus is present: locker rooms, pool decks, communal showers, and gym floors. Not everyone exposed to HPV develops warts — immune status plays a significant role in susceptibility.

What Plantar Warts Look Like

Plantar warts appear on the bottom of the foot, most commonly on weight-bearing areas — the heel and ball of the foot. They are typically flat or slightly raised, with a rough, grainy texture. A distinguishing feature is tiny black dots within the wart, often called “wart seeds” — these are actually thrombosed (clotted) capillaries feeding the lesion. When you pinch a plantar wart from the sides, it hurts; pressing directly down on it produces less pain. This side-to-side pinch tenderness differentiates warts from calluses, which hurt with direct pressure.

Mosaic warts are clusters of multiple warts that coalesce over a larger area — these tend to be more resistant to treatment than single isolated warts. Plantar warts can also grow inward under pressure (endophytic warts), making them deeper and more difficult to treat.

Over-the-Counter Treatment: When It Works and When It Doesn’t

Salicylic acid (the active ingredient in Compound W and PowerStep Freeze Away products) is available over the counter and works for many small, superficial, early plantar warts. Consistent daily application for 8–12 weeks is required — patients who use it inconsistently get poor results. OTC cryotherapy sprays are less powerful than in-office liquid nitrogen and frequently inadequate for deep or established plantar warts.

If OTC treatment has not worked after 8–12 weeks of consistent use, or if the wart is large, painful, or mosaic, professional podiatric treatment is more appropriate.

Professional Treatment Options

Cryotherapy (liquid nitrogen) remains a widely used and effective treatment. Liquid nitrogen is applied to the wart at -196°C, freezing and destroying the infected tissue. Multiple treatments spaced 2–4 weeks apart are typically needed. Cryotherapy causes some discomfort but is well tolerated with topical anesthetic preparation. It works best for single, discrete warts.

Cantharidin (blister beetle extract) is a topical agent applied in the office that causes a blister to form under the wart, lifting the lesion from the underlying skin. It’s painless at application but causes a blister that peaks at 24–48 hours. The blistered tissue and wart are debrided at the follow-up visit. Cantharidin is highly effective and well-tolerated by children and adults.

Intralesional bleomycin injection involves injecting a chemotherapy agent directly into the wart tissue, destroying the HPV-infected cells. Single-treatment cure rates of 60–95% are reported. It is reserved for recalcitrant warts that have failed other treatments.

Surgical excision under local anesthesia removes the wart entirely. This provides immediate resolution but leaves a scar — and scars on weight-bearing foot surfaces can be painful. Excision is reserved for isolated, recalcitrant warts when other methods have failed.

Pulse dye laser and CO2 laser therapies destroy wart tissue through targeted light energy. These are available in specialty dermatology and podiatry practices and are effective for mosaic and recalcitrant warts.

Prevention of Recurrence and Spread

Always wear flip-flops or water shoes in communal areas. Avoid touching or picking at warts, which spreads viral particles. Wash hands thoroughly after treating or touching warts. Keep feet clean and dry. Promptly treat any small, suspicious lesion before it becomes established. Immune-compromised patients are at higher risk for extensive and recurrent warts and may require dermatology coordination.

Schedule at Balance Foot & Ankle

If you have a painful plantar wart that hasn’t responded to OTC treatment, Dr. Tom offers in-office cryotherapy, cantharidin, and other professional wart treatments at locations in Howell and Bloomfield Township. Call (810) 206-1402 or book online.

Foot or Ankle Pain? We Can Help.

Balance Foot & Ankle — Howell & Bloomfield Township, MI

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Plantar Wart Treatment

Plantar warts can be painful and persistent, often resisting over-the-counter treatments. At Balance Foot & Ankle, we offer professional wart removal including cryotherapy, topical treatments, and surgical excision for stubborn warts.

Learn About Our Wart Treatment Options → | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Lipke MM. “An Armamentarium of Wart Treatments.” Clinical Medicine & Research. 2006;4(4):273-293.
2. Bruggink SC, et al. “Cryotherapy With Liquid Nitrogen Versus Topical Salicylic Acid Application for Cutaneous Warts in Primary Care.” CMAJ. 2010;182(15):1624-1630.
3. Sterling JC, et al. “British Association of Dermatologists’ Guidelines for the Management of Cutaneous Warts.” British Journal of Dermatology. 2014;171(4):696-712.

Dr. Tom Biernacki, DPM

Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.