The slight 'deviation' of the septum causes the bottom cartilage to stray a little left (or right) of center. One nostril is also larger than the other.
The fix? Surgery. If you don't mind watching someone chisel off seven to ten chunks of bone inside someone's nasal passage - have a look at this septoplasty.
That's the con. The chisel. The pros?
Google (again with the Google!) advertises a compelling before/after arrangement.
Sign me UP!