Plantar warts are one of the most common dermatological conditions affecting the foot, and one of the most frustrating — they are caused by a virus, resist many over-the-counter remedies, and can persist for years if not treated aggressively. At Balance Foot & Ankle, our Michigan podiatrists offer the full range of plantar wart removal options, including in-office chemical treatment, laser therapy, and surgical excision.

What Are Plantar Warts?

Plantar warts are caused by human papillomavirus (HPV), specifically types 1, 2, 4, 60, and 63, which infect the superficial layers of the skin on the bottom of the foot. The virus enters through tiny cuts or breaks in the skin and creates a thickened, sometimes painful lesion. Unlike most warts, plantar warts are driven inward by body weight, making them appear flat with a rough, callus-like surface — often with small black dots (thrombosed capillaries) visible in the center.

Plantar warts spread in moist environments — shared showers, locker rooms, pool decks, and yoga studios. Children and adolescents are most commonly affected due to immature immune response, though plantar warts occur at all ages. Patients with compromised immune systems (diabetes, HIV, immunosuppressive medications) may develop large, treatment-resistant clusters called mosaic warts.

How to Tell a Plantar Wart from a Callus

A callus forms over a bony prominence and has normal skin lines running through it. A plantar wart interrupts skin lines, shows a granular texture with black pinpoint dots, and is tender when pinched sideways (lateral compression) rather than directly from above. Shaving the surface of a wart reveals a cauliflower-like texture or bleeding capillaries; shaving a callus reveals normal skin.

Treatment Options

Salicylic Acid (First-Line)

High-concentration salicylic acid (40% compound) applied in-office or prescribed for home use causes keratolysis — chemical breakdown of the infected skin cells. Treatment requires consistent daily application and debridement over 6–12 weeks. Cure rates are approximately 70–80% with good patient compliance. This is safe for all ages including children.

Cryotherapy (Liquid Nitrogen)

Liquid nitrogen freezes the wart tissue, destroying infected cells and stimulating an immune response. Applied in-office every 2–4 weeks for 3–6 sessions. Most effective for smaller, single warts. Can cause blistering and temporary soreness after treatment. Cure rates of 70–80% when combined with salicylic acid between sessions.

Candida Antigen Injection (Immunotherapy)

Injecting Candida antigen directly into the wart stimulates a local immune response that can clear not only the treated wart but distant warts simultaneously. This approach is particularly effective for multiple or recurrent warts and mosaic warts. Typically requires 3–5 in-office injections spaced 4–6 weeks apart. Cure rates of 70–80% in studies, with the advantage of systemic immune activation.

Bleomycin Injection

Intralesional bleomycin — a chemotherapy agent — injected directly into the wart destroys the HPV-infected tissue with high efficacy (reported 70–94% clearance). Reserved for persistent warts that have failed other treatments. Can cause significant post-injection pain and requires careful technique to avoid digital necrosis.