About 2 months ago, after swimming at the YWCA, I developed a rash on
my back and on
the buttocks, and down the back of my legs. I went to my Dr, who put me on an antibiotic and prednisone. Within a week, it cleared some but never really went away, and yes, it was itchy. A month or so later, the rash came back, and I was put on prednisone again plus a cream. It cleared up. Now it's back again. I am suppose to have knee replacement surgery in a few days. What could this be?