Ringworm is a common skin infection caused by a fungus. It is called "ringworm" because it can cause a circular rash that is usually red and itchy, with clearer skin in the middle, giving it a ring-like appearance. Ringworm is not caused by a worm, and no worm is involved. It can affect different parts of the body, including the body, feet, groin, scalp, beard, hands, and nails. Ringworm often spreads by direct skin-to-skin contact with an infected person or animal, or by contact with infected soil. It is highly contagious and can be spread through contact with surfaces and household items such as clothing, towels, and bedding. Symptoms of ringworm may include a circular rash, itching, redness, and scaling. Mild cases of ringworm can be treated with antifungal medications applied to the skin, while more severe cases may require antifungal pills taken for several weeks. If you suspect you have ringworm, it is important to talk to your doctor, especially if the rash does not improve within two weeks of using an over-the-counter antifungal product.