You mention three different procedures, each which would require different waiting periods. If your acne is out of control, my recommendation is to handle that first - even if you have to wait a year for scar improvement. Any new acne that occurs following the scar treatments (or during, which is always a possibility) will potentially create even more scars than already exist.
However, if you decide to proceed with scar treatment first, here are some general guidelines
Microdermabrasion at standard levels should not require a waiting period. IF you have aggressive microdermabrasion that actually creates raw skin, you need to wait until your skin is healed.
Dermaroller will create small holes in the skin (somewhat on the idea of Fraxel but with no heat involvement.) I'd suggest a waiting period of 3- 4 weeks depending on the depth of the roller spike used. I assume you are speaking of the medical level Dermaroller and not the "home version". It is not recommended that you use Dermaroller with active acne.
Fraxel Restore is a variable energy laser and the amount of healing required is again dependent upon the levels used. I would suggest here again 4 to 6 weeks waiting period following your final procedure if you are treated at aggressive levels.
If the dermatologist who is prescribing your oral treatment with Accutane is also the treating physician for your scar treatments, that will be your final resource for advice.
