Why does corns and calluses cause thickened skin?

The outer layer of skin responds to repeated friction or load by producing and retaining more keratin, a tough structural protein. A callus is usually a broader area of thickened skin. A corn is often more focused, with a firm central core that can press into deeper tissue and hurt in a shoe. Common sites include the toes, soles, heels, fingers, and areas affected by tools or footwear. The thickening can return when the pressure source remains, even after the surface is reduced.

Choose shoes with enough room for the toes and a shape that does not rub. Soft socks, protective pads, or cushioned insoles may reduce pressure when fitted correctly. Keep the skin moisturised, and never cut a corn or callus with a blade at home. Do not use strong acid-based removal products without professional guidance, particularly if you have diabetes, reduced sensation, poor circulation, or fragile skin. A foot-care professional can assess footwear, gait, and the lesion safely.

Arrange an assessment if the area bleeds, cracks deeply, becomes very painful, changes quickly, or remains after pressure is removed. Seek prompt care for redness, warmth, swelling, drainage, or fever. Anyone with diabetes, reduced foot sensation, or circulation problems should obtain professional advice before treating thickened skin, because a small wound may be harder to notice or heal.

Is this a corn, callus, wart, or another lesion? What pressure point is causing it? Which footwear change or treatment is safe for my feet and medical history?