I have performed Rhinoplasty for well over 25 years and the answer is, it may or may not continue to get smaller 10 months after a Rhinoplasty. In thin skin and a primary Rhinoplasty, most patients are fully healed between 6-9 months following the Rhinoplasty. With thicker, oily skin or in cases of Revision Rhinoplasty the swelling may last for 12 months or more. Your Rhinoplasty Surgeon should be able to tell you more specifics about your case.
Web reference: http://www.drfpalmer.com