The red circles on the body may be caused by ringworm, pityriasis rosea, pityriasis floribunda, psoriasis and other diseases, which need to be analyzed according to the symptoms. 1. ringworm: it is caused by fungal infection, the lesion is a reddish dot at the beginning, gradually expanding into a round, oval dry patchy ringworm, the size is not certain, the border is clear, it can be a piece or a number of pieces, mostly accompanied by itching. 2. pityriasis rosea: at the beginning, the lesions are isolated rose-colored reddish spots, oval or ring-shaped damage, with clear boundaries, covered with fine scales, known as the mother spot. 1 to 2 weeks, the lesions gradually increase and expand, the shape of the mother spot, often oval, covered with a circle-shaped edge of free edge of the thin scales inward, the long axis and the skin line parallel. It is often accompanied by different degrees of itching. 3. Psoriasis: it is caused by the interaction of environmental factors, genetic factors, immunity factors and other factors. The lesions start as red papules or macules, and then gradually become red plaques with clear boundaries, which can be plaque-like, dotted-drop-like, map-like and other forms, with a thick layer of silvery-white scales, and itching of different degrees. Red circles on the body may also be caused by other diseases, it is recommended that patients seek medical attention in a timely manner, and actively cooperate with the relevant examination, in order to clarify the cause of the symptomatic treatment.