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New shoes can be uncomfortable at first, but used shoes add even more concerns into the mix. They’ve already been molded to someone else’s feet, creating snug pockets of uneven pressure. Poor sanitation is yet another issue because it can transfer sweat, bacteria or fungi, which can cause irritation or infection.
Switch shoes: Stop wearing the shoes that are causing the problem. Instead, choose well-built, comfortable shoes that have a wide toe box, good arch supports, and plenty of cushioning.