This is what Arginine does for wound healing: http://europepmc.org/abstract/MED/2382229 full text- http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1422590/

Collagen deposition in wounds is 74% higher!

Fish oil (omega 3's) will decrease collagen production: http://pen.sagepub.com/content/17/6/519.short

This study only had one person...zinc sulfate facilitated wound closure 43% sooner than the control: http://www.thelancet.com/journals/lancet/article/PIIS0140-6736(67)91031-8/abstract

Vitamin C probably won't do anything unless you have a deficiency http://www.karger.com/Article/Abstract/129395

So there you go, while and before getting treated for acne scars, don't ignore this aspect of wound healing.