I used a heating pad last night. I have a pad that has a control so that it stays on all night. Most pads shut off after 2 hours. Anyway, I layed on the pad all night on my right side. I got 3 blisters and some of my skin is thermal burnt. I have been in pain all day from it. I was reading that people with diabetes should not use heating pads. What is the reason why diabetics should not use a heating pad?