Will filler results disappear completely? Non surgical nose job

I read (here at Realself) that fillers can cause an inflammatory response that creates scar tissue around the filler, and that that could give some permanent fullness to the area in question (specially with repeated injections). I also heard that , after repeated injections the body will require less and less colagen (H.A) and last longer and longer. I don't really want to pay for the rest of my life. Is it true that scar tissue builds up with multiple injections?