Should I have a steroid injection on this bump on my nose? This is from a pimple that never flattened from years ago (Photo)

I have seen many complications from steroid injections into this area, if at too high a dose and if too superficial.  I would suggest have a formal evaluation, but you may be better off with fractional laser treatment and topical vitamin A creams over steroid injections.  Best, Dr. Emer.

Hi DNCA.  It's difficult to tell from the photo, but if the scar you are referring to is raised, then it would be a potential candidate for steroid injections.  Best bet would be to go to a consultation to show it to the injector in person.  To see an example of what steroids can do to shrink raised scar, you can view a keloid scar before and after picture at the link below.  

Best to have your dermatologist assess the area in person. There are a few ways to flatten down what may be a scar from an old pimple, but best to make sure there isn't something else going on there.

Your picture seems to show skin-toned bumps.  I do not see significant inflammation or redness/swelling, nor does it appear to be a thickened scar of some sort.  Though if I saw you in person, I would use a dermoscope (magnifying) light to examine for scar.  If there is no inflammation or scar, steroid injection treatment is unlikely to benefit or improve the bumps.  Instead if they're persistent skin-toned bumps, they are more likely to be benign nevi or papules (sebaceous hyperplasia, milia, angiofibroma, etc.), present in same place as a prior pimple by concidence.   It is common to get benign bumps on the nose with age.They could be removed with a gentle shave excision method by a dermatologist.  I recommend you see a board-certified dermatologist for further in-person evaluation. 

You need to be evaluated in person and it depends on what is underneath; cartilage, scar tissue etc. I recommend you have it checked out and dealt with by your plastic surgeon.