The blackening and reddish spots on your feet require immediate evaluation by your doctor or a diabetic foot specialist. These symptoms could indicate circulation issues or skin complications that need prompt attention. Please do not alter your current diabetes or nerve pain medications (such as glimepiride, metformin, or pregabalin) on your own, as maintaining stable blood sugar is critical right now. Your healthcare provider will perform a physical exam and blood flow tests to determine the exact cause, safely adjust your medication regimen, and prescribe the appropriate targeted treatment. Please seek professional medical care today to address this safely.