Rhinoplasty 8 years ago, past two years noticeable bump on left tip with white tint/patch of skin. What is this? (Photo)

Hard to give a definitive answer without an exam. This may be a sharp piece of cartilage or graft pressing into the overlying skin, blanching the skin and causing the appearance. This can happen overtime if the skin thins with age. However your pictures seem to have some surrounding redness too. Could be infection, clogged sebaceous gland, or even skin cancer. You really need to see a surgeon to know for sure. You could start with your original surgeon but there are also many fantastic facial plastic surgeons in your area- Drs Andrew Winkler, Adam Terella, and Stephen Weber- all to name a few. Check out the Americans aboard of Facial Plastic and Reconstructive Surgery to find board certified surgeons near you.

Hard to say what this is without examining it. If it is firm, this could be a piece of cartilage that is close to the surface of the skin that is now visible. This could also be a permanent pigmentary change to the nose since you have had 6 surgeries to correct your issue. If it bothers you, I would get a second opinion with a revision rhinoplasty specialist to better understand what is occurring. Hope this helps and best of luck.