I did have mild acne for a couple of years on my back and I didn't bother to do anything about it, but now I am on ethromycin and it has nearly cleared up. I'm just being left with scar tissue where it was. My first question is whether anyone knows how long it might take for the scar tissue to ever heal, assuming it ever will. Months? Years? The second is whether you ever had acne and your experiences with it. How you got rid of it etc. Cheers.