My podiatrist treated a pinched nerve in my foot with a cortisone shot in the fatty area belwo my ankle bone. The nerve condition has gotten worse, I have what looks like two symetrical freckles at the site as well as brownish erattic shaped rashes. the skin below the injection site has a grayish tint to it. In addition, my ankle is weak and sometimes painful. Should I be concerned and if so, what is the next step?