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Answer: It depends on what your feet look like. If you also have scaling or peeling on the soles or between your toes, you probably have athlete's foot -- the most common foot fungus, according to Dr. Jaliman. Try using an over-the-counter antifungal powder, and if you work out, change your sweaty socks immediately afterward (you can also keep feet drier by wearing socks made of a wicking fabric like CoolMax). Also, make sure that your shoes fit properly -- if they're too tight, you may get blisters, which can increase the chance of a fungal or bacterial infection. If that doesn't help, talk to your doctor about a prescription antifungal medication, either topical or in pill form. If your feet look perfectly fine but just smell bad, it's probably due to an overgrowth of bacteria-try an antibacterial soap (like Dial) and wash them well with a washcloth.
Originally published in Fitness magazine.