A red streak of wandering superficial veins, known as wandering thrombophlebitis, is present in the superficial veins of the affected limb, which may fade after a few weeks. After some time they may appear again in a different or the same area, with pain and tenderness. It is one of the clinical manifestations of thrombotic vasculitis. The cause is mainly due to the patient’s lack of vital energy and the inability of blood and Qi to reach the vascular endings, resulting in the gradual necrosis of the fingers or toes due to lack of nutrition. Diagnosis of red streaked, wandering superficial veins: The disease is mainly manifested by limb ischemia, as well as wandering phlebitis due to ischemia, ischemic neuropathy and secondary infection. The evolution of the disease can be divided into three phases. Phase I: local ischemic phase (1) Intermittent claudication: coldness of the affected limb, numbness or a feeling of tightness at the bottom of the foot. When walking a certain distance, cramping or swelling pain appears in the lower leg or the sole of the foot, which can be relieved by rest. As the disease progresses, the symptoms of intermittent claudication worsen. (2) Wandering thrombophlebitis: The superficial veins of the affected limb show red streaks, which may fade after a few weeks. They may reappear after a period of time in a different or the same area, with pain and tenderness. (3) Diminished or absent pulsation of the dorsalis pedis or posterior tibial artery. Phase II: Dystrophic phase (1) Resting pain: The pain in the affected limb is still unbearable at rest, especially at night, with painful moans and sleepless nights. (2) Nutritional disorders of the limbs: dry and thin skin, loss of sweat hair, atrophy of calf muscles, cold skin, pale or flushed complexion, and loss of arterial pulsation. Stage III: Tissue necrosis stage (1) With symptoms of work and stage II. (2) Ulceration or gangrene of the extremity: Initially dry gangrene, often appearing first at the end of one or two toes or next to the toenail, dry and black, gradually involving the entire toe, often forming a difficult to heal ulcer after shedding. Dry gangrene may turn into wet gangrene if secondary infection occurs.