Corn (Foot)
A thickened patch of skin from repeated pressure
Quick Facts
- Type: Skin (foot) condition
- Main cause: Pressure and friction, often from footwear
- Common spots: Tops and sides of toes
- Usually: Harmless but can be painful
Overview
A corn is a small, localized area of thickened skin that develops on the foot when an area is repeatedly pressed or rubbed. The skin hardens as a natural way to protect itself, but the resulting bump can become uncomfortable or painful, especially when it presses on the tissue beneath.
Corns usually form on the toes, where tight or ill-fitting shoes and toe deformities concentrate pressure. They are closely related to calluses, which are broader areas of thickening. Corns are generally harmless and respond well to simple care, though people with diabetes or poor circulation need to be especially careful with any foot lesion.
Symptoms
Corns have a recognizable appearance and feel. Common features include:
- A small, raised, hardened bump of skin, often round
- A firm, dense center sometimes surrounded by inflamed skin
- Pain or tenderness when pressed, especially in shoes
- Hard corns on the tops or sides of toes
- Soft corns, which are whitish and tender, between the toes where skin stays moist
Unlike a wart, a corn usually does not have tiny black dots and tends to hurt with direct pressure rather than when squeezed from the sides.
Causes
Corns form in response to repeated pressure and friction on the skin. Common contributors include:
- Poorly fitting footwear: Shoes that are too tight, too loose, or high-heeled.
- Toe deformities: Conditions such as hammer toe, claw toe, or bunions that make toes rub against shoes.
- Not wearing socks, which increases friction.
- Foot mechanics that concentrate pressure on certain spots.
- Repeated activities that rub the same area.
Risk Factors
- Wearing tight, loose, or high-heeled shoes
- Toe deformities such as hammer toe or bunions
- Foot conditions that alter how weight is distributed
- Activities or jobs involving prolonged standing or walking
- Diabetes or poor circulation, which raise the risk of complications
Diagnosis
A doctor or foot specialist can usually identify a corn simply by looking at it and examining the foot. They may:
- Examine the foot to confirm it is a corn and not a wart or other lesion
- Check footwear and foot shape to find the source of pressure
- Assess circulation and sensation, particularly in people with diabetes
Imaging is rarely needed but may be used if an underlying bone problem is suspected.
Treatment
Most corns improve once the pressure causing them is removed, along with gentle thinning of the thickened skin.
- Better-fitting footwear: Shoes with enough room for the toes are the most important step.
- Protective padding: Cushions or pads to relieve pressure on the corn.
- Gentle thinning: Soaking and carefully filing the skin with a pumice stone after softening.
- Professional care: A podiatrist can safely trim a thick corn and advise on orthotics.
- Treating the cause: Addressing toe deformities that keep corns coming back.
People with diabetes or poor circulation should not cut or use medicated corn removers without medical advice.
Prevention
- Wear comfortable, well-fitting shoes with adequate toe room
- Wear socks to reduce friction
- Use protective pads over pressure points
- Keep feet moisturized and the skin smooth
- Address toe deformities or foot mechanics that cause repeated pressure
When to See a Doctor
See a doctor or podiatrist if a corn is painful, keeps coming back, or does not improve with better footwear and self-care. Avoid trying to cut corns yourself.
People with diabetes or poor circulation should have any foot corn, blister, or sore checked promptly. Seek prompt care for a corn that becomes red, warm, swollen, or oozing pus, as this may signal an infection that can become serious in the foot.
Frequently Asked Questions
What causes corns on the feet?
Corns form when skin is repeatedly pressed or rubbed, most often by poorly fitting shoes or by toe deformities such as hammer toe and bunions that make toes rub against footwear. The skin thickens to protect itself.
What is the difference between a corn and a callus?
Both are areas of thickened skin from pressure. A corn is smaller, often round, with a dense center and tends to form on or between the toes, while a callus is a larger, flatter area usually on the sole or heel.
How do I get rid of a corn at home?
Switching to better-fitting shoes, using protective pads, and gently filing the softened skin with a pumice stone after soaking usually helps. Avoid cutting corns or using medicated removers without advice, especially if you have diabetes or poor circulation.
How can I tell a corn from a wart?
A corn usually hurts with direct downward pressure and lacks the tiny black dots seen in many warts, while a wart often hurts when pinched from the sides. If you are unsure, a doctor or podiatrist can tell the difference.
When should I see a doctor about a corn?
See a doctor if a corn is painful, keeps returning, or does not improve, and always if you have diabetes or poor circulation. Seek prompt care if it becomes red, warm, swollen, or oozes pus, which can mean infection.
References
- MedlinePlus, U.S. National Library of Medicine. Corns and calluses.
- Mayo Clinic. Corns and calluses — Symptoms and causes.
- American Academy of Dermatology Association. Corns and calluses.
- American Podiatric Medical Association (APMA).