Acne scars don't go away from the use of an antibiootic. Trust me, if it were that easy a lot more people would be taking them.
You probably just had some acne that was cleared up due to the drug. I've tried all 3 of the drugs you just mentioned and none of them worked for my acne. I had a doctor that was not-so-bright and he had me take minoclycline for a little over a year. This was before I knew that taking antibiotics for extended periods could make you become immune to the drug. All 3 of them seemed to work for about a week or so, but the effects stopped quickly after that.