My nostril is bigger than the other. What treatment would you recommend? (photos)

Thank you for the pictures and your question. Many factors contribute to nostril symmetry issues. These include deviation of the septum, asymmetry of the tip cartilages, and scar tissue. In many cases, cartilage grafts are used. These can help support the nostril rim and can also have a positive effect ton breathing by keeping the nostrils more open.

Dear kendell99,A small graft can be placed in that area to reinforce the nostril on your right to make it more even on the leftI am not sure I would make the other side smaller because it could lead to problems breathingIt would be best to see a rhinoplasty specialist who can examine you and guide you wellSee some before and after pics of some docs in your areaBest,Nima Shemirani

Nostril asymmetry can be normal or not.  Best to see you in person to be properly evaluated. Many things can contribute to this asymmetry.

The smaller narrower nostril is a "collapsed " nostril. You need support with a cartilage graft. In person examination will confirm the diagnosis and plan of treatment

This is an easy problem to correct with a clear and plain solution. You have for whatever reason less support of the lateral crus on the right side causing the nostril to sag inward. The only solution (correct approach) is to take a cartilage graft from the conchal bowl of the ear and place it into a pocket made in the lateral crus area. This will achieve the correction you yourself made in the photoshopped picture. The cartilage graft may soften slightly over the years but it is by far the best approach for this problem. I have probably done this easy procedure under local anesthesia in the office very successfully a hundred times over the past 25 years. DO NOT do any surgery to move the nostril itself ....it is not the problem and will leave an unsightly scar 

You may have a
deviated septum, but I'm not certain if correcting it would give your desired
result. I would recommend that you leave well enough alone.
Sometimes seeking a better result can lead to one that is worse.

Your nasal openings are narrow and appear a little collapsed.  This may have been present to some degree before surgery (no pictures; hard to tell) and is certainly noticeable now.  This may cause some breathing obstruction.  Cartilage grafts can fix this, and the procedure is relatively straightforward with low risk.  Since this is a revision you should see someone certified by the American Board of Plastic Surgery who has a strong background in revision rhinoplasty.  Be sure to see a portfolio of his/her pre- and post-op pictures so you can see the types of results that are reasonable to expect.