Runner’s gyrus erythema is an erythematous skin disease of unknown etiology, which may be associated with visceral tumors or with systemic sclerosis and dry syndrome. Erythema erythematosus prostrate is prevalent in elderly patients and is associated with visceral tumors, such as lung cancer, esophageal cancer, breast cancer, etc. It has also been found to be associated with tuberculosis, systemic sclerosis, and desiccation syndrome, etc. It is characterized by multiple circular erythema. The manifestation is multiple ring-shaped erythema, which develops and expands rapidly to the periphery, and the lesions develop in concentric rings, resembling timber-like or zebra-like texture, and may be fused with each other. The lesions are scaly and itchy. The rash often begins on the arms and lower extremities, and often generalizes throughout the body, with post-inflammatory hyperpigmentation. Erythema prostratum and visceral tumors can occur sequentially or in parallel. If the erythema is found first, it is necessary to consult a doctor for diagnosis and treatment of the cause, as well as symptomatic treatment. The erythema may disappear if the tumor is removed from the body, or it may recur if the tumor metastasizes or recurs. It is recommended that patients who find erythema nodosum should go to the hospital in time to avoid delaying their condition.