A piece of skin like ringworm may be due to psoriasis, pityriasis rosea, chronic eczema, ringworm and other factors. 1. Psoriasis: commonly known as “psoriasis”, is due to the interaction of immunity, genetics, the environment and other factors, can occur in any part of the body, manifested as a clearly defined red plaque, can be dotted, plaque and other forms, covered with silvery-white scales, often exacerbated in the winter, can be accompanied by joint swelling and pain, nails, and other abnormal symptoms. It can be accompanied by joint swelling and pain, nail abnormality and other symptoms. 2. pityriasis rosea: it is an inflammatory skin disease of unknown etiology, mostly occurring on the trunk and limbs, with typical symptoms of rose-colored patches and papules covered with furfuraceous scales, and the lesions are round or ring-shaped with clear boundaries, accompanied by varying degrees of itching. 3. Chronic eczema: generally believed to be the result of a variety of internal and external factors, can occur in any part of the body, serious cases can be diffuse throughout the body, manifested as skin infiltration of dark red patches on the pimples, scratches, scales, skin thickening, varying degrees of mossy changes, hyperpigmentation and other symptoms. 4. ringworm: is in addition to the scalp, hair, palm and plantar and nail other than smooth skin superficial fungal infections, is caused by the red trichophyton, trichophyton and other germs of infectious skin diseases, manifested as a dry border clear ring-shaped red spots, edge of the scales are more, usually a piece of or a number of pieces of the distribution, self-conscious itching, scratching may cause secondary infections or localized mossification. A piece of skin like ringworm may also be caused by other factors, it is recommended that patients seek medical attention in a timely manner, under the guidance of the doctor for relevant examinations, in order to clarify the cause of the disease, symptomatic treatment.