Corns and Calluses: What Actually Causes Them and What Actually Works

By Dr. Christopher R.D. Menke, DPM, FACFAS — Double Board-Certified Foot & Ankle Surgeon, Founder of 26 Apothecary

Corns and Calluses: What Actually Causes Them and What Actually Works

I have patients who have been getting their corns trimmed every 8 weeks for years. The corn comes back within 6 weeks every time. This pattern is one of the clearest examples in podiatric care of symptom management mistaken for treatment.

Dr. Christopher R.D. Menke, DPM, FACFAS — double board-certified in foot surgery and rearfoot and ankle reconstruction, founder of 26 Apothecary — explains the biomechanical drivers of corns and calluses and what conservative care actually addresses.

What Corns and Calluses Actually Are

What is a callus?

A callus — plantar hyperkeratosis — is a diffuse thickening of the skin that develops in response to repetitive, distributed mechanical pressure or friction. Calluses are most common under the metatarsal heads, at the heel, and on any bony prominence that is in chronic contact with footwear.

What is a corn?

A corn — heloma — is a more focused, conical keratin buildup with a central nucleus that extends deeper into the skin. Hard corns (heloma durum) form on the dorsal surface of toe joints or at bony prominences that contact shoe uppers. Soft corns (heloma molle) form between the toes where moisture prevents the keratin from hardening, creating a macerated, painful lesion.

What Drives Corn and Callus Formation

The mechanical driver in most cases is either direct pressure from a bony prominence against footwear, or abnormal plantar loading concentration at specific metatarsal heads. Hammertoes create dorsal toe joint prominences that contact shoe uppers and develop hard corns. Prominent lesser metatarsal heads — often associated with fat pad atrophy — create plantar calluses under specific heads. Narrow shoes that create lateral toe compression are the primary cause of soft corns between the toes.

Conservative Care That Addresses the Mechanism

Aperture pads — gel pads with a central cutout positioned around a corn or callus — redistribute pressure from the painful lesion to the surrounding tissue. A metatarsal pad positioned just proximal to the prominent metatarsal head shifts plantar loading away from the callus site. Footwear modification removes the external mechanical driver. Emollient moisturizers applied consistently reduce the keratin buildup rate and maintain skin suppleness that reduces cracking at callus margins.

What Does Not Work Long-Term

Removing a corn or callus without addressing the mechanical source produces temporary relief followed by recurrence. Corn-removal pads containing salicylic acid chemically debride the skin but do not address the mechanical driver. In people with diabetes, these products carry significant risk of chemical injury and should not be used.

When to See a Foot and Ankle Specialist

• Corns or calluses that are painful enough to limit daily walking or footwear
• Any corn, callus, or skin thickening in a person with diabetes — management should be performed by a podiatrist
• Corns or calluses with skin breakdown, bleeding, or signs of infection
• Recurrent corns in the same location despite footwear modification — this typically indicates a structural deformity driving the pressure

Frequently Asked Questions

Is it safe to remove a corn at home?

For people without diabetes or peripheral artery disease, using a pumice stone on callused skin after bathing is generally safe. Attempting to cut or blade a corn at home carries significant risk of skin injury and secondary infection. In-office debridement by a podiatrist is safer and more precise.

Why do I keep getting calluses in the same place?

Callus recurrence in a fixed location indicates a persistent structural pressure source. Common causes include a prominent metatarsal head, a hammertoe creating plantar prominence, or fat pad atrophy concentrating load at a specific point. Identifying and addressing the structural driver is the only way to achieve lasting reduction in recurrence.

Can orthotics reduce calluses?

Semi-rigid orthotics with a metatarsal pad or strategically placed offloading reliefs can meaningfully reduce the plantar pressure concentration that drives callus formation under the metatarsal heads. This approach is particularly effective for people with fat pad atrophy or prominent lesser metatarsal heads.

About the Author

Dr. Christopher R.D. Menke, DPM, FACFAS is a double board-certified foot and ankle surgeon — board-certified in both foot surgery and rearfoot and ankle reconstruction. He completed his podiatric medical training at Temple University School of Podiatric Medicine in 2005 and his residency at Northlake Medical Center and DeKalb Medical in Georgia, completing in 2008. He is the founder of 26 Foot and Ankle and 26 Apothecary, and the founder of Surgeons of Service, a Georgia-based humanitarian surgical nonprofit. Every product in the 26 Apothecary catalog was selected through the same clinical lens Dr. Menke applies in the exam room and the operating room.