Corns vs. Calluses: Understanding the Differences in Foot Skin
When a hard patch of thickened skin forms on the sole or toes, people often describe it as either a 'callus' or a 'corn.' Both develop as the skin's protective response to repeated friction and pressure, causing the outer layer to thicken. However, they differ noticeably in location, shape, and the type of pain they cause. This article outlines how to distinguish corns from calluses, why foot skin thickens, and what to be careful about when managing them.
How are corns different from calluses?
A callus is a broadly spread area of evenly thickened skin with indistinct borders and a smooth surface, and it usually causes little to no pain. It commonly appears on weight-bearing areas such as the heel or the ball of the foot. A corn, on the other hand, forms when pressure is concentrated on a small area, causing the thickened skin to grow inward in a cone shape. Because it has a hard core at its center, pressing on it or even walking can cause a sharp, localized pain. Corns tend to appear on narrow areas that rub against footwear, such as between the toes or on top of them.
Why does foot skin thicken in the first place?
When a particular area of skin is repeatedly exposed to pressure or friction, the skin responds by thickening itself as a form of protection. Common causes include ill-fitting shoes, high heels or narrow toe boxes, walking habits that concentrate weight on certain spots, and structural changes in the foot such as flat feet or bunions. In people with diabetes, reduced peripheral sensation can make it harder to notice pressure points, and wounds may heal more slowly, so extra caution is generally advised when managing foot skin in these cases.
Is it okay to remove the thickened skin at home?
Gently filing softened skin after soaking the feet in warm water is generally acceptable, but aggressively cutting it with sharp tools or using over-the-counter corn patches for extended periods without guidance is not recommended. Corns in particular tend to recur if the central core isn't properly addressed, and forceful self-treatment can create wounds that become infected. For those with underlying conditions such as diabetes or peripheral vascular disease, even small wounds may heal slowly, so seeing a medical professional is generally recommended over self-care.
How can I tell a corn apart from a plantar wart?
Corns and plantar warts can look similar and are often confused. Corns tend to hurt when pressed directly but less so when squeezed from the side, whereas plantar warts, caused by a virus, typically hurt even with lateral pressure and often show small black dots (tiny clotted blood vessels) on the surface. Since the two conditions have different causes and treatments, it's advisable to have a dermatologist confirm the diagnosis when it isn't clear from appearance alone.
What can help reduce recurrence?
Corns and calluses tend to come back after removal if the underlying pressure and friction aren't addressed. Choosing shoes with adequate room in the toe box and a moderate heel height, and using silicone pads or custom insoles to redistribute pressure away from concentrated points, can be helpful. When structural issues such as bunions or toe deformities are involved, an orthopedic evaluation may also be needed alongside skin care.
This information is for general reference only. An accurate diagnosis and treatment require consultation with a board-certified dermatologist.
Find more information on our skin health blog.