Tinea corporis is a clinical term for ringworm that occurs in the inguinal region. In addition to this, ringworm infections of the perineum, perianal region, and buttocks also fall under the category of ringworm. It is also known as “ringworm” that occurs in specific areas. Tinea corporis is caused by Trichophyton rubrum, Trichophyton rubrum, Trichophyton verrucosum, and Microsporum canis, and is spread by direct and indirect contact. Like tinea corporis, tinea cruris is characterized by a ring, semi-ring, or polycyclic lesion with significant inflammation at the edges, and may be accompanied by significant pruritus. The initial rash usually consists of red papules, papules, or small blisters; as the disease progresses, the initial rash increases and fuses, gradually destroying the stratum corneum and forming red patches with scales on the surface; subsequently, the edges of the lesions expand outward, while the inflammatory response in the center of the lesions decreases, leaving only mild hyperpigmentation, thus eventually showing a ring-shaped lesion with heavy peripheral inflammation and light central inflammation. In addition, if ringworm is prolonged, it may present local chronic eczema-like or mossy hyperplasia and hypertrophy due to long-term scratching irritation, and the central inflammation of the lesions is similar to the edges, and it is also difficult to present a distinct ring appearance. Such ringworm requires the use of topical preparations with anti-inflammatory effects in combination with topical antifungal drugs to relieve itching and cure it.