Pea sized lump on bridge of nose that moves with the skin (Photo)

When a bump on the bridge of the nose is caused by cartilage or bone, moving the skin will result in the bump staying in the same place. Since your bump moves with your skin, this could be a small cyst on the bridge of your nose. If your rhinoplasty specialist is not comfortable removing it, please consider visiting a reputable cosmetic dermatologist. I hope this helps! Since the only Dr Joseph

Hi, It is better for you to consult with your facial plastic surgeon who can examine you and give you opinion based on examination.

Given that you can see and feel this, it is definitely worth discussing with your surgeon as to what it may represent. There's a chance that it's a small, displaced piece of a cartilage graft.
The pictures don't make me feel like it's scar tissue as your issue is so localized. There's also the chance that it could be a foreign body reaction to sutures, if placed.
Regardless your surgeon should have a good explanation and plan of care for you in this situation which appears able to be resolved.