A corn on a foot looks like a small, round bump of hardened skin, usually flesh-colored, with a distinctive whitish or slightly translucent center. That center, called the core, is the defining feature that sets corns apart from other patches of thick skin. Corns are typically smaller than a pencil eraser, and the skin around them often looks irritated or slightly swollen.
What a Hard Corn Looks Like
Hard corns are the most common type. They appear as small, dry, rough bumps with a dense, hardened center you can usually see or feel. The surface is firm to the touch, and the surrounding skin may be slightly raised and inflamed. They’re usually flesh-colored or yellowish, with that telltale white or waxy-looking core in the middle.
You’ll most often find hard corns on the tops and sides of your toes, especially the little toe, and on the tops of the joints where your toes bend. These are all spots where bone sits close to the surface and presses outward against your shoe. If you press directly on a hard corn, it typically hurts, because the hardened core acts like a cone that points inward, pushing into the deeper layers of skin.
Soft Corns and Seed Corns
Soft corns look quite different from the hard variety. They form between your toes, usually between the fourth and fifth, where moisture from sweat keeps the skin damp. Instead of a firm, dry bump, a soft corn has a rubbery, whitish, sometimes macerated appearance. It can look like a small patch of waterlogged skin. Soft corns still have a core, but the surrounding tissue stays soft because of the constant moisture trapped between the toes.
Seed corns are the smallest type. They appear as tiny, discrete dots of hardened skin on the bottom of the foot, often in clusters. Each one is only a few millimeters across. They tend to show up on the heel or the ball of the foot and are usually painless or only mildly uncomfortable.
How Corns Differ From Calluses
Corns and calluses are easy to confuse since both involve thickened skin, but the differences are visible once you know what to look for. Calluses are larger, flatter, and more spread out, with an irregular shape and no defined center. They develop on broader weight-bearing areas like the ball of your foot or the heel. Corns are smaller, rounder, and deeper, with a clearly defined hard core that calluses lack. Calluses also rarely hurt, while corns often do when you press on them.
How to Tell a Corn From a Plantar Wart
This is one of the most common mix-ups, especially when the growth is on the bottom of your foot. A few visual clues help you tell them apart.
- Black or red dots: Plantar warts almost always contain tiny dark specks (small clotted blood vessels). Corns never do.
- Central core: Corns have a translucent, waxy-looking center. Warts lack this feature entirely.
- Skin lines: Look at the natural lines on the skin of your foot, similar to fingerprints. Calluses and most corns preserve those lines. Warts interrupt them completely, so the skin lines stop at the edge of the growth and pick up again on the other side.
- Surface texture: Warts often have a rough, slightly cauliflower-like surface. Corns are smooth and firm on top.
A simple test: squeeze the growth from the sides. Warts tend to hurt more with side-to-side pressure, while corns hurt more with direct downward pressure on the center.
Why Corns Form Where They Do
Corns develop wherever skin gets repeatedly squeezed between bone and an outside surface, almost always a shoe. Your body responds to that friction by building up layers of dead skin cells as a protective barrier. Over time, the buildup compacts into a dense cone that points inward toward the deeper tissue, which is why corns can feel like you’re stepping on a pebble or why pressing on one sends a sharp sting.
Tight shoes, high heels, and shoes with narrow toe boxes are the most common culprits. Foot deformities like hammertoes or bunions make corns more likely because the altered bone position creates new pressure points. Going without socks also increases friction. People who spend long hours on their feet or whose feet slide inside loose shoes are especially prone to them.
When a Corn Looks Abnormal
A typical corn is a small, dry, firm bump that may be tender but otherwise stays put. Some changes in appearance signal a problem. Redness spreading outward from the corn into the surrounding skin, pus or fluid draining from the area, increased swelling, or streaks of red moving away from the site all suggest infection. A corn that suddenly becomes much more painful without a change in footwear is also worth paying attention to, particularly if you have diabetes or poor circulation in your feet, since reduced blood flow makes infections harder to fight and slower to heal.