Damp towels are a breeding ground for bacteria, yeasts, mold, and viruses. A dirty towel can cause toenail fungus, jock itch, athlete’s foot, and warts. Yikes! To avoid this, change or launder your towel at least once a week and make sure it dries between uses. Hang it spread out on a towel bar rather than from a hook to help it dry quicker. Wash towels more often when you’re sick and if your home is humid, like during the summer.