How is a late onset seroma managed?

My implants are 10 years old (sillicone, textured, under the muscle). My right breast became swollen and my surgeon has retired so I can't call him. I'm on antibiotics and had a scan which showed a seroma and no rupture. They did a fine needle aspiration and sent the fluid off for testing. No results yet. They are testing for BIA-ALCL and I assume infection also. If it's not ALCL or infection, how would this usually be managed? Am I definitely going to need more surgery?