Corn on the Foot: Types, Treatment and Prevention

What a corn is

Skin thickens to protect itself when it is pressed or rubbed over and over. Spread over a wide area, that thickening is a callus. Focused on a small point, usually over the knuckle or tip of a toe bone, it forms a corn: a tight core of dead, compacted skin cells that points inward like a cone.

The core presses on nerves in the deeper skin. That is why a corn causes a sharp or burning pain when you press directly on it or walk in shoes that squeeze it. For a side-by-side look at both lesions, see calluses and corns.

Types of corns

Soft corns form where the bone of one toe presses on the next. They can crack and become infected, and they are sometimes mistaken for athlete's foot.

What causes corns

• Shoes that do not fit: narrow toe boxes, high heels that push the foot forward, and shoes that are too loose and let the foot slide.
• Toe deformities: hammer toes, claw toes and mallet toes push the knuckles or tips into the shoe. A bunion crowds the toes together.
• No socks, or socks with thick seams.
• Walking or foot structure: a high arch, flat feet or a prominent bone shifts weight onto small areas.
• Activities: running, dancing and jobs that keep you on your feet all day.
• Reduced fat padding on the sole, which is more common in older adults.

Corn vs callus vs wart

If you are unsure, a podiatrist or dermatologist can tell by paring the top layer. A plantar wart bleeds in pinpoints when pared, while a corn shows a clear, glassy core.

How to get rid of a corn at home

If you are healthy with good feeling and circulation in your feet:

1. Take the pressure off. Wear shoes with a wide, deep toe box and a heel under about 5 cm (2 in). This alone lets many corns fade over a few weeks.
2. Soak the foot in warm water for 5 to 10 minutes to soften the skin.
3. File gently with a pumice stone or foot file. Remove a little at a time over several days. Stop if it hurts or the skin turns pink.
4. Moisturize daily with a cream containing urea (10% to 25%) or salicylic acid to soften thick skin.
5. Pad it. Non-medicated, ring-shaped foam or silicone pads and toe separators cushion hard corns and keep soft corns dry.

Medicated corn plasters containing salicylic acid can work for healthy adults. Follow the label, protect the surrounding skin and stop if the area becomes sore or red.

Professional treatment

A podiatrist can:

• Pare (debride) the corn with a scalpel and remove the core. This is painless because the skin is dead, and relief is often immediate.
• Make custom padding or orthotics to shift pressure away from the area.
• Advise on footwear and fit silicone toe props for hammer toes.
• Treat vascular or neurovascular corns, which are hard to remove fully and can need repeated care.

If a bone deformity keeps causing corns despite these steps, a foot surgeon may suggest straightening a hammer toe or removing a small bone spur. Surgery is reserved for people whose corns keep returning and cause pain.

Corns and diabetes

In people with diabetes, nerve damage can mean a corn is not felt, and reduced blood flow slows healing. The pressure that forms a corn can also break down the tissue underneath, which is a common starting point for a diabetic foot ulcer. If you have diabetes:

• Check your feet every day, including between the toes.
• Never self-treat corns with blades or acid plasters.
• See a podiatrist for all corns and calluses, and have a foot check at least once a year.

Preventing corns

• Get both feet measured. Shop in the afternoon, when feet are largest.
• Leave about a thumb's width between the longest toe and the end of the shoe.
• Wear well-fitting socks every time you wear shoes.
• Use toe separators if your toes rub together.
• Treat underlying toe deformities early.

Frequently asked questions

What is the difference between a corn and a callus?

A corn is small and has a hard central core that presses into deeper skin, so it hurts when pressed. A callus is a broader, flatter patch of thick skin without a core, usually on the sole or heel, and it rarely hurts. Both are caused by pressure and friction.

Do corns go away on their own?

Yes, often. Once the pressure or rubbing that caused the corn stops, the skin gradually returns to normal over a few weeks. If you keep wearing the same shoes, or a toe deformity keeps pressing, the corn will usually come back.

Why do I have a soft corn between my toes?

Soft corns form when the bone of one toe presses on the next one, usually between the fourth and fifth toes. Sweat keeps them moist and white. Wider shoes, toe separators and keeping the area dry help. See a doctor if the skin cracks or looks infected.

Is it safe to dig out a corn?

No. Digging or cutting a corn at home can cause bleeding and infection, especially if you have diabetes or poor circulation. Soak and file the skin gently instead, or ask a podiatrist to remove the core safely.

Does a corn have a root?

Not in the way a plant does. The "root" people describe is the hard central core of compacted dead skin. It forms from pressure and is not alive. Once the core is removed and the pressure is relieved, the corn does not regrow from it.