Tinea corporis is a fungal infection that occurs in the bilateral groin area because it is often moist. In the clinic, there will first appear some small lesions, let’s say a piece of lesions the size of a fingernail, including erythematous or brown spots with a small amount of scales on the surface, but as the fungus keeps multiplying, it spreads in a circular pattern and gradually spreads outward in a circle, it has a very clear periphery with some papules, papules, and even some scales on the surface, and after spreading with the ring, it tends to heal in the middle, but it gradually It gradually spreads to the periphery, and the area becomes larger and larger, while the patient feels itchy. Because the groin is a humid and sweaty place, it usually occurs in the summer, and the incidence of ringworm is often high, especially in the summer when many patients come to the clinic. It is a fungal infection, and many people who are hygienic may also develop ringworm because the source of infection is often transmitted from ringworm of the feet, so it is important to wash socks and underwear separately to prevent cross-infection if you have ringworm of the feet.