Is This Scar Tissue from the Rhinoplasty?

Bump inside nose and trouble breathing may be related to the bump. See your surgeon to examine this and find out the cause.

After a rhinoplasty, at the end of the operation, it is highly important to be technically meticulous in the closure of the internal incisions.  If this are is closed inappropriately, you can develop an extra fullness around the scar or even a shelf-like drop off and both the internal and external valve of the nostril can collapse causing breathing obstruction.  From the photos submitted this could also represent an obstructed gland creating swelling at the incision site and the same result occurs.

As you are now 8 months postop and beginning to struggle with this finding I would recommend evaluation by a Board certified specialist and consider a steroid or kenalog injection at this time if this represents scar tissue and possible excision if a cyst is encountered.  No revision of the result of the overall nose should be considered until you truly are at the 12 month mark.  So feel comfortable that you will retain the nice result already in existence. Typically, kenalog injections separated out monthly for a total of 3 injections is reasonable to determine if this conservative approach will help improve your breathing.

If at the 1 year mark you continue to struggle, an in-office procedure, to reduce and revise the singular scar is all you would likely need to maintain and improve your breathing and again, maintain the cosmetic result.

Great you like the look, though the breathing problem may be caused by the septum, or by displacement of the cartilage in the bridge or tip of the nose. Your surgeon may have an idea for you, or you could see a surgeon locally to help sort tings out.
Best of luck,
peterejohnsonmd