I have a really bad blister rash after butt implants. Can you help me find the problem?

I had Butt implants done April 13 2018 so a month and a half ago. I have a really bad blister rash after butt implants, doctor thought it was fungus so he prescribed me cream and it made them three times the size and hive looking bumps. There not touching the stiches. It’s on both butt checks, a inch wide, 3 inches down about. I’ve been re stiched twice since sergery. There was a lot of fluid at first and now everything is healing great. But now there’s this horrible rash. The blisters have even popped .