How to get rid of calcified seroma from liposuction?

I had tumescent lipo on my abs and flanks over a year ago. I had a fluid pocket that I believe was a seroma to the right of my belly button that was about 4 inches in length. It became hard after a few months. I asked a surgeon to have steroid injections but she suggested i wait, there's a chance it would just go away. It's over a year now and it feels like a muscle. Is it too late for steroid injections? What options do I have non surgically or is surgery the only option? I really hate the bump