Hello, my name is Theresa, I am 75yrs old. I cut myself while fishing a couple of weeks ago, did put peroxide & then neosporium (Spelled wrong sorry) covered it & changed it often. Even went to my Dr. & he said it looks like it is healing & put me on an antibiotic, which I finished. Now, it looks bad again. I do have some Mupirocin Ointment but wasn't sure if I should use it or not. Can you help me.