Why does one side of my nose/nostril stick out more than the other? (Photo)

Your lower lateral cruras or alar cartilages seem to be signigicatively assymetrical, this can be treated along with other nasal features you might wish to improve.The best option is replacing both alar cartilages by new custom taylored pieces of symmetrical shape and size, since obtaining symmetry with those you have now is merely impossible.Your is a very interesting case for the right surgeon, not an easy case, needs large experience in congenital and secondary noses.

Rhinoplasty to address the size and shape of your nose should help you address your concerns. You have to understand that there is no such thing as the “perfect” nose. As rhinoplasty surgeons, we are able to improve the structure and function of the nose to address specific issues you have with how your nose looks and and how well you can breathe. Perfect symmetry does not exist in nature. Attempts to improve the symmetry of your nose should be aimed at achieving an improvement in your asymmetry to the point where it is no longer very noticeable. If you look carefully enough, you will always be able to find imperfections. The goal is a normal looking nose that is in harmony with the rest of your anatomy.

Hi. There is definitely an asymmetry which could be attributed to the trauma. It is amenable to fixing the cartilage with a tip rhinoplasty. Regards. Damien

It does appear from your images that there is a difference in your nasal tissues between the two sides. This could be related to trauma or just  the way your cartilages developed over time.Asymmetries like this can be corrected with nasal surgery. This would most likely involve using sutures or select cuts to make the cartilage on each side more similar. I would recommend a consultation with a facial plastic surgeon who performs rhinoplasty on a regular basis to have a consultation with complete examination of your nose. Together with your surgeon you can explore the possibilities for correction of this through rhinoplasty. 

It is likely that your nasal deformity is related to previous trauma.  This would be amenable to treatment with a rhinoplasty.

It is hard to say from the pictures only, but you may have some asymmetry of the alar cartilages, which could, or could not, be a consequence of the trauma you remember.The asymmetry is not particularly visible, so the decision to have a surgical procedure to improve it would be completely yours.