There are two main ways in which a rotten diabetic foot can manifest itself. One kind of diabetic foot is localized with pain. This situation of diabetic foot manifestation is mainly localized black, there is no swelling manifestation, because of the vascular problems of diabetic foot, blood vessels are not smooth, the toes can not be blood transport, there will be this dry necrosis, it looks like the foot is not swollen, bias purplish red or ischemia, this situation is ischemic state. At this time it is necessary to pay attention to this situation, to the hospital to seek medical treatment, do relevant further examination. There is another kind of diabetic foot manifestation is localized very red, very swollen, but there is no pain, why is there no pain in this case? Mainly because diabetes affects the neuropathy, resulting in the toes have no feeling, red, swollen, but the blood vessels are not a problem, the blood vessels can pour blood out, there will be no infected tissues, there are some secretions out, it will be manifested as a swelling, and some even pus oozing out, there will be a bad smell. Many of these patients, because at the beginning there is a little redness and swelling, but there is no feeling, did not care, and then the bad smell, smelled, only to come over to seek medical attention, this situation should be timely medical attention, to further surgical treatment in a timely manner, clean up the necrotic tissues, and then do further repair.