Have you ever slipped into a pair of second-hand shoes and noticed a strange yellow bump appearing on your toe? This common issue can be uncomfortable and concerning, but it’s usually not serious. In most cases, that yellow bump is a corn or callus—a thickened area of skin that forms as a protective response to repeated friction or pressure.
What Causes It?
Used shoes are a frequent culprit because they may not fit your feet perfectly. The previous owner could have molded the shoes to their foot shape, creating pressure points, seams, or worn areas that rub against your toes differently. This constant irritation leads to:
- Friction: Your toe rubs against the inside of the shoe, especially if it’s tight, narrow, or has a stiff toe box.
- Pressure: Ill-fitting shoes squeeze the toes, particularly the big toe or pinky toe.
Over time, your skin thickens to shield itself, forming a hard, raised bump that’s often yellowish in color due to the buildup of dead skin cells (keratin). Hard corns typically appear on the tops or sides of toes and have a central core that can feel painful when pressed—like walking on a pebble.
Other less common possibilities include: