Diabetic wounds send clear warning signals before becoming life-threatening. Redness spreading beyond half a centimeter from the wound edge means infection is advancing. Discharge changing from clear to yellow or green indicates heavy bacterial growth. Dark brown or black tissue signals cells dying from lack of oxygen. Foul odor that wasn\'t there yesterday suggests anaerobic bacterial infection. Fever or sudden blood sugar spikes mean infection has entered your bloodstream. Crackling feeling under skin indicates gas-producing bacteria. Recognizing these warnings early and seeking immediate medical help prevents sepsis, gangrene, and amputation.