Hard Bump on Left Side of Nose

Did you have a previous rhinoplasty? If so sometimes this can occur. If it's more then 12 months then you will likely nee to have it smoothed. Good luck!

There is a fair amount of swelling that occurs after Any rhinoplasty normally.   As the general swelling subsides some bumps may present after the camouflage is absorbed.  A revision or rasping down the bump may be in your future, but you are 6-9 months away from knowing.  Do remember that this will probably not be as involved as the primary surgery.

At 3 months after your Rhinoplasty, a hard bump that can't be pressed away would most likely be bone.  The nasal bones, if fractured with osteotomies during the Rhinoplasty, can shift causing a lump, bump or asymmetry.  You should ask the surgeon that did your Rhinoplasty for advice.

IMHO, no a closed nasal reduction is an unreliable procedure used on newly fractured nose from trauma...where an instrument is placed up the nose and the nasal bones are shifted towards the midline.  It's borderline barbaric, IMO and doesn't properly realign the fractured cartilage or bone.  A Rhinoplasty is much more reliable.

If the lump you describe is indeed nasal bone, it would need to be rasped down or re-fractured.