Can number of fat cells decrease after this unique situation? Please help.

I recently had a systemic inflammatory reaction to sculptra, which is settling down. During the time I was having an extreme reaction my Dr prescribed me Methylprednisolone(6 day pack) then 1wk later I was prescribed prednisone for 1wk. I gained 11lbs QUICKLY. I'm naturally tiny & fit & now have lots of new fat padding around hips & stomach area. I have been off the steroids 3.5wks. Are these new fat cells permanent or can they disappear to my normal body I've wrked so hard for my entire life?