This fungal infection causes red, itchy, ring-shaped rashes on the top layer of your skin. It can show up anywhere on your body, and it’s very contagious. Many types of fungi can cause it, and they’re all around you. They can live on your skin as well as on floors, countertops, clothing, towels, and bedsheets. A number of antifungal creams, sprays, and pills can get rid of the infection, but it sometimes comes back in problem areas.