Possible to shave down a bump on one side of nose without osteotomies?

It is hard from your description to tell exactly but sometime the bump can be improved just by "sanding", or rasping it down.

A small bump can be reduced with rasping instead of osteotomies. It is a smaller procedure than osteotomies and can be done under local anesthesia. RegardsDr. J

Hello and thank you for your question. It is possible to reduce a small dorsal hump without osteotomies in the right patient.  Make sure you specifically look at before and after
pictures of real patients who have had this surgery performed by your surgeon
and not just a computer animation system. The most important
aspect is to find a surgeon you are comfortable with. I recommend that you seek
consultation with a qualified board-certified plastic surgeon who can evaluate
you in person.
Best wishes and good luck.
Richard G. Reish, M.D.
Harvard-trained plastic surgeon

When shaving down the dorsal hump, it doesn't take much to create an open roof deformity, therefore  Osteotomyies are usually required in the nasal bones to straighten  and narrow them, and close the open roof created from the hump removal. A full set of photographs required to make a determination along with an in-person examination. The hourglass issue also be addressed with osteotomies in addition to spreader grafts placed underneath the concave upper lateral cartilages.

Most of the time, taking down a small bony nasal "bump" can be done with only a rasp, and osteotomies can be avoided.  Osteotomies are usually performed if the "bump removal" leaves the patient with a wide/flat dorsum.  

Shaving down a small sidewall bump probably would not need an osteotomy.  If the bump is large and involves the dorm, it may make the nose appear flat.

It is difficult to provide any definite guidance, in your case, without photography but, in general, it is possible to correct a slight hump as long as it is small and does not represent a true excess of cartilage of bone at the level of the rhinion (mid-bridge). Often, the type of hump that you are describing is due to splaying of the nasal bones, and simple rasping of this can correct the slight apparent hump without the need for osteotomies, and this may make the bridge slightly thinner. However, if there is true excess of cartilage and bone, then this must be removed, and this often requires performing bone cuts (lateral osteotomies). In this later case, the bridge may actually appear slightly broader because the bridge is not as projected. If the hump is more prominent on one side than the other, the surgeon should make asymmetric cuts/hump reductions to ensure that the end result is asymmetric. Hope this helps, best of luck!