If a diabetic patient finds signs of blackened feet, he or she must go to the hospital in a timely manner because this condition is critical and often indicates that the diabetic foot has reached a more serious stage, that is, gangrene or necrosis has occurred in the diabetic foot, in which case immediate treatment may be required to expand the blood vessels to improve the local blood supply as soon as possible. The blackened foot is due to a serious disorder of circulation and nerves in diabetic foot patients, resulting in the blackened part of the foot not receiving adequate blood supply, resulting in necrosis and eventually forming a blackened condition, blackening generally indicates necrosis and gangrene, so timely treatment is very necessary, otherwise the corresponding infection of the blackened tissue will spread to the whole body, resulting in the formation of systemic multi-organ failure, and the patient may even The patient may even pay the price of life.