Ringworm is kind of a misleading name, because it's not caused by a worm at all but by a fungus. It can start as a red bump, maybe even a little bit itchy, and then spread in a ring that can have a red raised border, sometimes a little bit of flaky skin. An easy way to test for this if your doctor is concerned is to do a scraping and look at the slide under a microscope or send the same to a laboratory. Treatment can be either an over the counter cream for athlete's foot. Those are all anti-fungals. Those will all work against ringworm. Or your doctor can write you a prescription. The best way to prevent ringworm is to have good hygiene. Keep the skin clean and dry. the fungus that causes ringworm likes areas that are warm and wet. So it's important that, say you have it on the foot, that you would wear shower shoes in the shower, keep your feet clean and dry, and wear clean, dry socks.