Why is one of my nostrils caving in? (Photos)

My entire life the right side of my nose jas been caving inward, seeming kind of flat. The bottom tip of fhe right side also appears longer than the other. My mother claims it is because I was born premature and spent 3 months in the hospital with pipes in my nose, but that seems quite unrealistic. Why may this be, and what is the solution? I do not want a complete nose job that gives me a compleely different nose, but simply a symmetrical Nose. What may be a good option for me?