Hi Cathy..
If the pain and lumps in the feet were RSD moving to that area.. or even mildly presenting in your feet then cortizone shots would be considered very invasive by your feet.. and of course it's not progressing like they'd expect, the needles directly into a flaring RSD spot can present this way though.. I have seen it written a few times somewhere.. hmm..
http://www.rsdrx.com/rsdpuz4.0/puz_78.htm
Dr Hooshmand's lists of 20 detremental treatments talk of inserting a needle in an RSD area.. and I have seen cortizine shots used as an example elsewhere with blisters being the result as well

. causing a venipuncture RsD picture, This could most likely cause a spread of symptoms as well Cathy, I am so sory you are going through this.

If I can help let me know ok,
Sandra