Does nose scraping make your bump (on a nose) more visible? Can you do it more than once?

A bump occurs when there is a focal elevation of bone and/or cartilage along the nasal bridge.  Rasping (or scraping) is meant to reduce the area of elevation in order to bring the nose into a more pleasing alignment.  Most of the time rasping reduces the appearance of a bump. However, if you instead reduce parts of the nose adjacent to the bump, the bump can look more noticeable. You should proceed with the revision as long as you remain confident in your doctor. It should make matters better, not worse. Best of luck.

The bump on the nose is made up of both cartilage and bone.  Scraping tends to only remove the bony hump and leave the cartilage behind.  Reduction of cartilage bumps is usually done with specialized scissors and small blades.  You can indeed have a revision to the hump reduction but you may want to have a second opinion before doing so.  A board certified plastic surgeon who regularly performs rhinoplasty and revision rhinoplasty would be your best bet. 

The purpose of rasping (or scraping) is to remove the prominent bone or cartilage.  Your bump should be less visible.

Typically scrapping or rasping as it is called improves the hump. I've never seen it worsened because one is removing tissue not adding. Make sure your surgeon understands your concerns before proceeding with surgery.Stepehn M. Davis, MD, FACSGreen Hills Plastic Surgery

If you are referring to a bump on the nasal dorsum or bridge, this can be shaved down further with an additional procedure.  It usually does not make the bump worse. If planning to do this again, make sure you have a thorough discussion with your rhinoplasty surgeon about your expectations. Best of luck.