When performing subscision and fillers, I prefer to use collagen-stimulating fillers such as Radiesse (Calcium hydroxyapatite) for more significant and longer lasting results.
Another treatment option is using Rejuran healer (Polynucleotide) during subscision, which also stimulates collagen formation.
Although HA fillers can be used to fill subscised scars, in general, their potential for stimulation of collagen is less and may not yield as optimum results in comparison.
Lastly, not all scars are best treated by subscision +/- fillers. Besides the morphology of scars (e.g box, ice-prick scars), it is important for the scars to be manually felt for distensibility.
I would suggest having a quick evaluation by a doctor who has both the interest and experience in acne scar management.
Hope this helps!
Cheers,
Dr David Deng