Persistent blocking in nostrils after septoplasty - what could this be and how can it be corrected? (photo)

I had septoplasty and turbinate reduction. Since surgery, I have persistent blockage in one of my nostrils. It looks like a lump from the septum. Other nostril is clear. I have been back to my own surgeon and he has confirmed that there is no more swelling in the nose and the septum looks straight. So, what is this bump then, that is blocking my nose 24/7 Should I be seeking a second opinion or is this normal?