Secondary Symptoms of Diabetes?

I am about 60, controlled hypertensive via ACE inhibitor. After a stressful period my blood glucose popped higher than 120, maybe to 150 range. Doctor put me on diet. Last two fasting blood glucose tests were normal, A1C tests were below 6.0

My cousin told me that a skin problem might be a diabetes secondary symptom but I get mixed signals from a dermatologist and my primary care physician.

My fingers and toes get hard skin. The skin on my fingers starts to split/bleed - sometimes spontaneously, often with physical stress like tennis. Neither physician says this is a diabetic side effect. Since my blood sugar is currently under control, I shouldn't have this kind of problem as a secondary symptom. Nor does stuff I've found online seem to exactly match my symptom.

Does anyone out there have any experience with this kind of problem? Am I looking at one or two conditions here? Just trying to sort it all out. Any help would be appreciated.