If you find that your feet sweat, you might use an antiperspirant. Alternatively, for a home treatment, sprinkle a little corn starch into your shoes to keep your feet dry. "You may also use a normal underarm antiperspirant—that will absolutely assist to manage the moisture," Dr. Rowland explains. If you wear nail polish often, it can cause your feet to sweat. So, next time you paint your nails, be sure to put some sort of sealant over the top to keep out any more moisture than already exists on your skin. If you work in an office full of people who don't wash their hands after using the bathroom, you're going to get sick more often. That's just how things work at scale. So, while washing your hands is important, make sure you aren't wasting your time by washing everything else first.