When can I see maximum results from picosure? I had 3 and noticed little improvement.

I just had 3 picosure focus for a certain facial scar. They treated the entire face but gave many passes on this certain scar i wanted to improve.I see it has raised but little improvment on the raised pigmented parts of this major scar that i have.Derm says i should continue tx to see max results as collagen will peak 2 wks post last tx & will no longer see major improvement after that.Talked to another derm but this time she says i can see maximum results after 3 months.So whats the real deal.