Can water retention last for years after surgery?

This is a really important question. Swelling resolves in weeks to months, but there are very rare circumstances where this lasts from 6-12 months. The greater concern is that you have too large of facial implants in place. I would recommend evaluation by a facial specialist to review your concerns.The most
important factors responsible for your future success are directly related to
your surgeon’s training, board certification, surgical specialization, and
observed outcomes. Hopefully this is helpful to you.Be healthy and be well, James M. Ridgway, MD, FACS

Swelling typically is improved weeks to months after surgery.  If you feel more large or swollen this may be scar tissue that needs treatment.  Best, Dr. Emer.

Thank you for your question.  It would be highly unusual for you to still have "water retention" from a surgery a year ago.  The body always swells to a degree after any surgery, but this is typically gone and diminished in weeks.