10 years post op - What can be done about the bulge on the side of my nose? (photos)

I had rhinoplasty done almost ten years ago, and whilst I love the results overall, I've had this bulge on the left side of my nostril since it was done. I brought it up with my surgeon and he said it would continue to soften. It feels like cartilage (I think)... I can push it in, but it bounces back. What is it? Can it be fixed? Could I have done something differently to avoid this?