✅ Medically reviewed by Dr. Thomas Biernacki, DPM — Board-Certified Podiatrist · Last updated April 6, 2026

Corns and Calluses: What They Are, Why They Form & How to Remove Them

Corns and Calluses: What’s the Difference?

Corns and calluses are related conditions — both are areas of thickened skin that form in response to repeated pressure and friction. The difference is in their structure and typical location. Calluses are broad, flat areas of thickened skin with no central core, typically forming on the ball of the foot, heel, or ball of the big toe. Corns are smaller, concentrated areas with a central hard core (nucleus) that points inward, causing the distinctive sharp pain when pressed. Corns typically form on or between the toes.

Why They Form

Both are the skin’s protective response to repeated mechanical stress. When the same area of skin experiences chronic friction or pressure, the body responds by thickening it — essentially creating natural padding. The problem is that this thickened tissue itself can become the source of pain when it accumulates beyond a functional level, or when the central nucleus of a corn presses on deeper tissues and nerves.

Common causes: shoes that are too narrow or tight; bony prominences (bunions, hammer toes) that create pressure points; high heels that concentrate forefoot load; going barefoot on hard surfaces; gait abnormalities that create unusual pressure points; and abnormal foot mechanics.

Safe Home Removal

Soaking

Soak the foot in warm water for 15-20 minutes to soften the thickened tissue. This is the essential first step — attempting to file or remove hard, dry callus without soaking is much less effective and risks skin damage.

Mechanical Removal

After soaking, use a pumice stone (easiest), callus file, or electric callus remover to gently reduce the thickened tissue. Use circular or back-and-forth motions. Important: go slowly and don’t remove too much in one session — the goal is gradual reduction, not removing everything at once. The skin underneath needs time to normalize.

Urea-Based Creams

Urea at 20-40% concentration is keratolytic — it breaks down the proteins in thickened skin and softens calluses significantly with regular use. Apply after soaking, and use a heel sock or cotton sock overnight to increase penetration. Products like Gold Bond Rough and Bumpy, Flexitol, and AmLactin are excellent for regular maintenance.

Chemical Corn Removers

OTC salicylic acid pads (PowerStep Corn Remover) soften the corn for easier removal. Important cautions: never use chemical removers on irritated or broken skin, and diabetic patients should not use chemical corn removers — the risk of skin damage is too high without adequate sensation to detect it.

Padding and Offloading

Donut-shaped moleskin or corn pads remove pressure from the corn while it’s being treated. These are some of the most effective interventions for pain relief while waiting for the corn to resolve.

When to See a Podiatrist

See us for corns or calluses that: are painful despite home treatment, recur rapidly after removal (this indicates a biomechanical cause that needs addressing), occur in a diabetic patient (any skin lesion in diabetics needs professional evaluation), show signs of infection (redness, warmth, pus, fever), or have a soft center (soft corns between the toes can be associated with sinus tracts).

Prevention

The most important prevention is addressing the cause of friction: properly fitting shoes with adequate width and depth, orthotics to redistribute pressure from bony prominences, toe separators for interdigital corns, and padding over pressure points. Corns removed without addressing these underlying causes will inevitably recur.

Products Our Doctors Recommend

• Callus Removers & Urea Creams
• Proper Footwear to Prevent Corns
• Browse All Products →

Frequently Asked Questions

Is it OK to cut a corn at home?

Gentle pumice stone reduction after soaking is safe for most people. Using a blade or scissors to cut corns at home is not recommended — you can easily cut into normal skin and create an open wound. Diabetic patients should never attempt home corn removal with any tool other than a pumice stone, and should see a podiatrist for professional trimming.

Do corns have roots?

No — corns don’t have roots like a plant. The central nucleus (the “root” people describe) is simply the hardest, deepest part of the corn. It does not grow into deeper tissues. Completely removing the nucleus and the surrounding thickened skin resolves the corn.

Why do I keep getting calluses in the same place?

Recurring calluses in the same location indicate a persistent biomechanical cause — a bony prominence, gait abnormality, or poor-fitting shoe creating repeated friction at that specific site. Addressing the underlying cause (often with orthotics, appropriate footwear, or sometimes surgical correction of a bony prominence) is the only way to prevent recurrence.

Are calluses ever beneficial?

Yes — moderate calluses on the heel and ball of the foot provide natural protection for these high-load areas. The goal of home care is to keep them at a comfortable, manageable level, not to eliminate them entirely. Completely removing heel callus leaves the skin vulnerable to painful fissures.

What’s inside a corn?

A corn is entirely composed of thickened keratin (the protein that makes up the outer layer of skin). The central nucleus is particularly dense, highly organized keratin. There’s no foreign body, fluid, or infection involved in a typical corn — it’s simply an overgrowth of the skin’s outer layer in response to pressure.

About the Author: Dr. Tom Biernacki, DPM is a board-certified podiatric surgeon and founder of Balance Foot & Ankle Specialists, with locations in Howell and Bloomfield Hills, Michigan. He has treated over 5,000 patients.

Related Treatment Guides

• Corn & Callus Treatment
• Plantar Fasciitis & Heel Pain Treatment
• Custom 3D Orthotics
• Sports Foot & Ankle Injury Treatment

Medical References & Sources

• American Podiatric Medical Association — Patient Education
• American Orthopaedic Foot & Ankle Society — Foot Conditions

Clinical References

1. Freeman DB. “Corns and calluses resulting from mechanical hyperkeratosis.” American Family Physician. 2002;65(11):2277-2280.
2. Singh D, et al. “Fortnightly review: plantar fasciitis.” BMJ. 1997;315(7101):172-175.
3. Grouios G. “Corns and calluses in athletes’ feet: a cause for concern.” The Foot. 2004;14(4):175-184.

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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.