Is it normal to get blisters and rash after breast reduction?

I am now almost four months past my breast reduction surgery and I still am having problems. I have a rash...or at least it looks like a rash....rough and red over one side of the scar. It is not that the scar is red....but the skin around it. I also seem to be constantly getting blisters around the scar area. Sometimes they are blood blisters and other times just water blisters. My family dr figures that I have a yeast infection...so he put me on a cortisone cream and antibiotic cream.