Will my nose appear different after getting bumped 6 months after my rhinoplasty surgery?

In the absence of a new nasal fracture (broken nose) or dislodging of the septum from underneath the nasal  bones, minimal trauma to the bridge of the nose should not cause and permanent changes to the shape of the nose. It is fairly common for uneven swelling to result from a forceful blow to the nose -- this may take several weeks to resolve.

Please follow-up with your surgeon and have him evaluate your nose to make certain that no permanent damage was done.

To cause permanent change to your nose it would take quite a bit of force at this stage. It sounds like no controlled bone fractures were done at the time of your surgery, but even if there were they'd be healed by now.

I would certainly recommend visiting with your surgeon to just make sure, though. Icing the area in the meantime may help with the swelling you're noticing.

By 6 months out from rhinoplasty, your nose should be well healed and the force required to break your nose would be essentially the same as if you had never had nasal surgery. After rhinoplasty, I usually advise my patients that after 6-8 weeks, they may resume contact sports (basketball, football etc.) in which the risk of getting hit in the nose is fairly high.

All that being said, significant trauma to the nose, as you have described, could certainly change its shape. I would recommend applying ice to your nose for the first 24-48 hours and then making an appointment to see your surgeon within a few days. If you did rebreak your nasal bones, your surgeon may be able to straighten them by simply pushing them back into place (closed reduction) before they heal in a crooked fashion. 

Best,

Dr. Mehta