I have bulbous cartilage on one side of my nose; what is the treatment? (photo)

Hello and thank you for your question and photograph.  I think you would be a good candidate for a tip-refining rhinoplasty where your nasal tip cartilage is modified. 
The next step for you is
to find the right aesthetic plastic surgeon.  In your rhinoplasty
consultation, be sure your surgeon addresses all your aesthetic goals and concerns
specifically, and discusses the surgery details including the position and size
of the incisions used (with actual photographs and not just digital animations),
the risks and benefits of the procedure, recovery time, and post-operative
course.  Also, be sure to see plenty of before-and-after pictures in women
who have a similar nose appearance to yours, and preferably at different time
frames (3 weeks out, 3 months out, etc) to more accurately predict your own
surgical outcome.
And lastly, I think the most
important component of the consultation is to establish a good connection with
your plastic surgeon.  It’s the connection that allows you to clearly define your desired nose outcome
goals, the first step of this whole process. If you don’t feel you have a
good connection with your plastic surgeon after your consultation, he/she may
not be the best surgeon for you.
Good luck.
Mark K Markarian, MD, MSPH
Harvard-trained Aesthetic Plastic Surgeon

It's hard to tell from a front picture only, but it does appear you have mild asymmetry on the tip of your nose.  Often this can be addressed with a tip rhinoplasty which can decrease the bulbous nature and improve symmetry.  If a tip rhinoplasty is all you need there's no need to manipulate that nasal bones, your recovery is very swift.  To fully evaluate, we would need to see profile view, but your best best is to be evaluated in person by a  oard-certified plastic surgeon.

Dear Annie,     Thanks for submitting your picture, though a side view picture would have been helpful. From observing your picture, you appear to have asymmetrical bulbous tip, where the right  lower lateral cartilage is more bulging, the right nostril is higher and the columella  looks retracted.   Reducing the size of the lower lateral cartilage , will weaken their structure , allowing the right nostril to move downward, creating more symmetry. Suturing the domes together will thin and refine the tip. Placing cartilage graft in a pocket at the lower part of the  columella will create a more attractive and up tilted profile.   Always, consult with experienced board certified plastic surgeons who operate in accredited surgery center for your safety. Most importantly, check the before and after pictures , to make sure that they are numerous, consistent and attractive with nice balance and harmony.                          Best of luck,                                                    Dr Widder