I have been ill for about 4 years. dibillitated. now I have treated and am up and around on my feet. I am trying to strengthen my legs and spend most of the day moving around and exercising. I do have some damage to some nerve bundles at spinal area due to spondylolisthesis. I now have discovered indentations on my inside shin area and inside calf of my left leg. this area is half way between my ankle and knee. There is no pain there.What could be causing the indentations?