Ok. I have made it 20 months or so now with this lovely new life of mine without any real setbacks. Just recently I have noticed a growing black spot on the heel of my foot the size of a pencil eraser. I am scared it may be a bed sore. I am now sleeping with it elevated, but not seeing any healing. Any ideas or suggestions? Actually, I believe it to be getting worse. The only thing I have changed is using a new wheelchair. But I have had the spot well before the new chair.