Tinea pedis infection easily occurs in the extremities is the symptomatic manifestation of lower extremity atherosclerotic occlusive disease in the first stage (mild complaint stage), the patient only feels that the skin temperature of the affected limbs is reduced and afraid of cold, or mild numbness, easy to fatigue after activities, and the extremities are prone to tinea pedis infections which are not easy to be controlled. Atherosclerotic plaques form on the inner wall of the arterial blood vessels, and as the plaques increase in size and the lumen narrows, the smoothness of the pipeline is affected, and the blood flow to the lower limbs decreases, and when the narrowing reaches a certain degree or even complete blockage, the blood flow supplying to the lower limbs fails to meet the needs, and ischemic symptoms of the lower limbs appear. Examination of limbs susceptible to uncontrollable tinea pedis infections: A detailed history and careful physical examination, such as pulse palpation of the limbs and auscultation of the abdominal and femoral-popliteal arteries, are necessary for diagnosis. The initial diagnosis of atherosclerotic occlusive disease can be made on the basis of the strength or disappearance of the pulse and the presence of murmurs, as well as on the basis of symptoms such as rest pain, abnormal sensation, or numbness, as well as nutrient deficiencies in the limb tissues, ulcers, or gangrene, etc. X-rays may show arterial plaque calcification, and the ankle/brachial index on examination of uninjured blood vessels may be <1, or up to 0.5 or less in severe cases. Arteriography may show multiple elongated and twisted arteries, diffuse irregular narrowing of the lumen, or segmental occlusion to clarify the diagnosis. Patients may be accompanied by hypertension, hyperlipidemia, hyperglycemia, coronary heart disease, stroke, etc., which is helpful for diagnosis. However, X-ray radiographs without arterial calcification and normal blood lipids cannot exclude the presence of atherosclerotic occlusion. In order to further clarify the location of the lesion and determine the treatment plan, it is still necessary to improve the following major auxiliary examinations. Lower extremity vascular color ultrasound: This examination is non-invasive and painless, and can basically determine the location of the patient's lower extremity vascular lesions, the degree of stenosis, and the status of intravascular blood flow. Ankle/brachial index: This test is very simple, non-invasive, easy to tolerate, repeatable, etc. We usually consider that ankle/brachial index ≤ 0.9 is considered to be ischemic in the lower limbs. Multi-row spiral CT arteriography: Through the three-dimensional reconstruction technology after the examination, we can understand the blood filling situation in the blood vessels of the lower limbs through the vascular reconstruction, and understand the stenosis site and degree of stenosis of the blood vessels of the lower limbs, so as to guide the determination of the clinical treatment plan. Lower extremity arteriography: it is the "golden index" for the diagnosis of vascular diseases, especially for the more complicated vascular diseases, it can make accurate judgment, but because it is an invasive examination, it is not easy for some patients to accept.