In my case I was actually sent to a reconstructive surgeon and he said that if my wound is not healing now, then the surgery may fail. Your case may be different, but that's what he told me.
You should really try the Microcyn that I am using now. I have not measured my wound but I have been using it for 4 weeks now and it "Looks" smaller and is very clean and no infection anymore. It actually accelerates the healing process. Plus its really cheap!