1, skin petechiae: due to poor blood flow and vascular lesions in the feet, scattered petechiae, petechiae, blisters, and pigmentation, usually purplish or black, appear on the skin of the feet and legs, which are precursors of diabetic foot. 2, pruritus: itchy skin symptoms, cold extremities, persistent numbness, edema, and the presence of pins and needles and burning pain in the affected area. 3.Intermittent claudication: due to ischemia and motor nerve damage in the lower limbs, the pain in the lower limbs is suddenly unbearable, while walking with a limp. 4, skin ulceration: due to poor circulation in the lower limbs, once a small wound is difficult to heal, it is easy to invite bacterial infection, so that ulcers aggravate long-term non-healing; this should be early to the trauma repair specialist hospital for consultation and treatment, do not delay delay resulting in aggravation of the injury. 5, joint deformation: foot neuropathy leads to muscle and bone changes, and eventually joint deformation. Diabetic foot is a complication of diabetes, and its subsequent harm can never be ignored. Many people are negligent because of small injuries and pains, resulting in wound ulcers that do not heal and eventually have to be amputated, mainly because they did not pay attention in the early days and were not treated in time, which eventually led to the disease becoming more serious.