What is this bump inside my nostril? (photos)

Great question and thank you for providing photos!
Given the appearance and timing, my guess is this is a small infection or abscess, possibly related to a retained suture. This should be handled as soon as possible as you don't want the infection to spread to other areas within the nose after a rhinoplasty which can sometimes be devastating. I would call your surgeon right away and see how they would like you to proceed as this likely needs to be drained and/or have you started on antibiotics.
Hope this helps!Kyle Kimura, MD

Talk to your surgeon about this; this may be some scar tissue inside your nostril, or it may be a little granuloma or abscess related to a suture that was used during your rhinoplasty. Either way, your surgeon should be able to help this situation.

It’s common for minor irregularities, such as scar tissue, to persist for months after rhinoplasty as your nose continues to heal. However, the sudden appearance of a bump, especially if it's firm and tender, could indicate localized swelling, a minor infection, or a collection of scar tissue forming. Since it’s near your incision and feels tender, it’s best to consult your surgeon for an assessment to rule out infection or other complications. Your doctor may suggest monitoring it, or they might recommend a treatment like a corticosteroid injection to reduce the swelling.