Buying second-hand shoes often feels like a clever, eco-friendly decision—until your feet start protesting. One of the most common things people notice after wearing used footwear is a small yellow bump appearing on a toe. It can look worrying and feel uncomfortable, but in most situations, it’s simply your body responding exactly as it should. That yellow bump is most often a corn or a callus. Both form when the skin is exposed to repeated pressure or friction in the same spot. To protect itself, the skin produces extra keratin—the same tough protein found in hair and nails. As these...
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