the only thing which heals scars/scarring is time and moisturiser.
ii have used erythromycin and isotretinoin once before didn't get sud results...but heck i am yet to try neutrogena face wash(the same one in which prachi sardesai comes in its promo ??Isotretinoin + Erythromycin + Neutrogena acne wash seems to be doing the trick for me. Worked well for my cousin too for removing scars.
They're a bit expensive though; 10g of Isotretinoin gel costs Rs.350 and the Neutrogena face wash costs Rs.450 for 250ml. They do last for at least 4-6 months if you use them carefully though.