My father has diabetes from few years and from last 1 to 2 years some black blood spot is found on both the toes according to you why is this same?

Seeing Spots.: Diabetes doesn't necessarily cause your toes toe acquire black spots. In fact, there are many possible reasons that can be attributed to black spots on the toes. Some of these reasons can be more serious than others and would best be evaluated by a doctor with a trained eye for recognizing possible causes. It is probably best to have your father's feet examined by his doctor. Remove all doubt.