Tinea corporis is a dermatophyte infection that occurs on areas other than the scalp, hair, palmoplantar, and nails, and is commonly characterized clinically by circumscribed, polycyclic lesions with markedly active marginal inflammation, accompanied by significant pruritus. Tinea corporis rashes usually begin as red papules, papules, or small blisters; as the disease progresses, the initial rash increases and fuses, and the stratum corneum is gradually broken down to form red patches with scales attached to the surface; subsequently, the edges of the lesions continue to expand outward, while the inflammatory response in the center of the lesions decreases and tends to subside, leaving mild pigmentation, thus eventually presenting a ring-shaped lesion with heavy peripheral inflammation and light central inflammation. In addition, it is important to note that if ringworm has a long duration and occurs in a scratch-prone area, it may present a localized chronic eczema-like or mossy hyperplasia due to long-term scratching irritation, and it is difficult to present a distinct annular appearance because the central inflammation of the lesion is similar to the edges; ringworm that occurs on the face is also difficult to present an annular lesion because the face is cleaned more frequently and contains abundant sebum, making it clinically Tinea corporis that occurs on the back of the feet has a clinical appearance that is dominated by the blistering scales and macerated erosions common to tinea pedis, and a typical ring-shaped rash is also less common. Therefore, tinea corporis is characterized by annular and polycyclic pruritic lesions with a heavy peripheral inflammation and a light central inflammation, with polymorphic manifestations on the face and dorsal surface of the foot.