Gangrene caused by thromboembolic vasculitis is usually dry gangrene, with the typical symptoms of a dry, crumpled, black necrotic area, clearly defined from the surrounding tissues, and mild changes in putrefaction. Repeated episodes of thromboembolic vasculitis can lead to long-term chronic ischemia of the tissues, and gangrene of the diseased side of the limb can occur in severe cases of ischemia. Because it mainly involves the middle and small arteries causing obstruction, the venous return is still smooth, so it is often manifested as dry gangrene. Due to excessive water loss, hemoglobin combines with necrotic tissue, and the necrotic area is often black and dry and crumpled, with clear boundaries with normal tissue, with the progress of the disease, the affected area can be completely necrotic and fall off (common in the toes). Thromboembolic vasculitis with gangrene manifestation should be actively to the hospital for treatment, treatment of trauma, and active treatment of vasculitis, in order to avoid the development of the disease, resulting in adverse consequences.