Why is there a new bump on the bridge of my nose four months after a septoplasty/turbinate reduction? (photo)

I had a septoplasty and turbinate reduction on September 10th. It is four months post-surgery and my nose looks different, despite my doctor telling me it wouldn't. But there is a noticeable bump in my nose that didn't exist before. At my appointment a month ago, the mini cat still showed quite a bit of swelling. During my recovery period I also had a root canal and crown placed on an upper back molar. Could this bump really just be swelling? Or could something have gone wrong in my surgery?