It is true your scars may be too superficial to be injected with a permanent filler like silicone1000 or artesense/artefil. If it is injected too close to skin surface, there is a possibility a bump will occur or it at least can be noticed. you can use hyaluronic acid products like juvederm for shallow scars but theres a real chance it wont last more than a week or 2.mine was always metabolized within afew weeks was a total waste.the permanent fillers work great in the right type of scars collagen used to work great for shallow acne scarring for up to 4 months zyplast but allergan took it off the market several years ago when the hyaluronic acid products surfaced because they lasted twice as long leaving many acne patients in the dust..if u have shallow indents surface scarring I would highly recommend saline injections in those.i have been doing this since march 2007.look up saline injections for acne scars under reviews I just wrote 1 yesterday along with several other people, good luck