Do Steroid Injections (Cortisone) After Rhinoplasty Rid or Just Prevent Scar Tissue?

I am nearly 6 weeks post-op. My nose has looked fuller within the last week and it may be due to scar tissue. I am seeing my doctor next month (at 7.5 weeks post op) and am going to ask him about a cortisone injection. Would an injection get rid of scar tissue that's already formed or just prevent even more from forming? I already had a cortisone injection at 1 week post-op. I have been massaging my nose daily and it usually makes my nose look more refined, albeit temporarily.