Round red patches on the body are considered for the following diseases: 1. Tinea corporis: The initial lesions of tinea corporis are red papules, papules, or small blisters that later form scaly red patches with clear borders, with the edges expanding outward continuously and the center of the rash tending to fade to form red patches with clear borders in an annular or polycyclic pattern. Patients will feel itchy, due to long-term scratching irritation, causing local eczema-like or tinea-like changes. 2, pityriasis rosea: is a characteristic lesion and specific course of inflammatory self-limiting disease, the initial rash after about 1-2 weeks, can appear pan-emergent rash, lasting about 6 weeks. The lesion will initially have a mother spot, which is a round or oval, pale red or yellowish-brown spot on the trunk or proximal extremities, with fine scales called a mother spot. One to two weeks after the appearance of the mother spot, the trunk and proximal extremities may appear as a majority of patches, rose-red in color, covered with fine bran-like scales, with the long axis in line with the skin line.