I've spent MANY years battling Acne and have come to the conclusion that testosterone and candida are my triggers for break-outs.
Sloughing off skin layers helps scarring somewhat, minimizing them over the years. Another option is something called "photo facial elite" with a laser, but it's expensive (apr $500 per treatment) and usually takes more than one treatement..no guarantees there.
I'm hoping HA will help scarring as it has such wonderful effects on the connective tissue (skin)...will let u know!