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

Plantar warts (verruca plantaris) are benign growths on the bottom of the foot caused by human papillomavirus (HPV) infection of the skin. Unlike warts on other body parts, plantar warts grow inward — pushed deep by body weight — creating a hard, painful lesion that makes every step uncomfortable. At Balance Foot & Ankle, Dr. Tom Biernacki offers multiple plantar wart treatments including the revolutionary Swift microwave therapy, which achieves some of the highest clearance rates of any wart treatment available.

How to Identify a Plantar Wart

Plantar warts appear as thickened, rough, flat lesions on the heel or ball of the foot. Key identifiers: tiny black dots within the lesion (thrombosed capillaries — the wart’s blood supply), pain with side-to-side pinching rather than direct pressure, and disruption of normal skin lines (fingerprint-like lines) at the lesion site. They are often confused with calluses or corns — which Dr. Biernacki can quickly differentiate by paring the lesion down.

Why Plantar Warts Are Stubborn

The HPV virus infects only the superficial skin cells, staying below the immune system’s radar. Warts can persist for months to years without treatment. Standard over-the-counter salicylic acid products have modest effectiveness (around 50% clearance) when used consistently for weeks to months. Professional treatments achieve higher, faster clearance rates.

Plantar Wart Treatments at Balance Foot & Ankle

Swift Microwave Therapy — Swift is a breakthrough wart treatment that delivers a precise, controlled microwave energy dose into the wart tissue. This creates a local heat response that activates the immune system to recognize and eliminate the HPV virus — not just in the treated wart, but throughout the body. This is why Swift can clear warts that have failed other treatments. The treatment takes seconds per lesion, requires no anesthesia, no open wounds, and no post-care restrictions. Multiple sessions (typically 3–4, spaced 4 weeks apart) are required. Clearance rates in clinical studies exceed 75–80%.

Cryotherapy (liquid nitrogen) — Freezing the wart destroys the infected tissue and stimulates immune response. Treatments are performed every 2–4 weeks. Clearance typically requires multiple sessions. More effective on smaller, superficial warts. Can cause blistering and temporary soreness.

Cantharidine (“Beetle Juice”) — A topical chemical applied in-office that causes the wart to blister and peel away. Painless at application; the blister develops over 24–48 hours. Very effective on thick plantar warts and favored for children due to the painless application.

Prescription topical acids — Higher-concentration salicylic acid preparations, trichloroacetic acid (TCA), and compounded formulas are applied regularly to chemically destroy wart tissue layer by layer. Effective when used consistently with professional debridement.

Surgical excision — Reserved for large, resistant warts. Dr. Biernacki excises the wart under local anesthesia and addresses the tissue base to prevent regrowth. Post-operative care and a short period of protected walking are required. Risk of scarring makes this a last resort.

Preventing Plantar Warts

HPV thrives in warm, moist environments — locker rooms, pool decks, and public showers. Wear flip-flops in these areas, keep feet dry, and avoid touching warts or walking barefoot if you have an active infection. The virus enters through tiny cuts or abrasions in the skin.

Get Wart Treatment in Michigan

Balance Foot & Ankle offers plantar wart evaluation and treatment at southeast Michigan offices. Call (734) 479-6200 for a same-week appointment with Dr. Biernacki.

Frequently Asked Questions

Stubborn Plantar Warts? We Can Eliminate Them

Plantar warts resist over-the-counter treatments because they grow deep into the skin. Our podiatrists use professional-strength therapies including cryotherapy, laser, and surgical excision for lasting results.

Clinical References

1. Vlahovic TC, Khan MT. “The human papillomavirus and its role in plantar warts.” Clin Podiatr Med Surg. 2016;33(1):55-71.
2. Kwok CS, et al. “Topical treatments for cutaneous warts.” Cochrane Database Syst Rev. 2012;(9):CD001781.
3. Mulhem E, Pinelis S. “Treatment of nongenital cutaneous warts.” Am Fam Physician. 2011;84(3):288-293.

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.