Human skin can be temperamental. We're unlikely to get through our lives without getting some kind of unpleasant rash or fungal infection. While this isn't particularly nice, these infections can usually be treated at home. Ringworm, also known as jock itch or athlete's foot, depending on the affected area, is a common skin problem. The name might strike horror into your heart, bringing to mind ideas of insidious parasites and invasive medical treatment.