Diabetic foot lesions are usually not simply lesions of occluded or narrowed blood vessels, but are often combined with diabetic microangiopathy, diabetic peripheral neuropathy and diabetic skin lesions, which involve multiple tissues and make the presentation of the condition more complex. Usually, diabetic peripheral neuropathy and dermatopathy first involve sensory nerves, which manifests itself in patients who are slower to detect changes such as pain and chills in the lower extremities than normal patients, and sometimes may not feel too much pain even with severe ischemic ulcers, and in some patients, pain sensation disappears completely.