So, like I couldn't even technically create a Scar on the finger by continuously creating damage at the same place to destroy some details and create new ones?
You don't even need to damage your fingers more than once. You just need to get the damage deep enough. Burning with thermal energy or chemicals would do it. You would NOT enjoy the process or the result.
that wouldn't create a new one just alter the old one. you would have to destroy / scar / whatever your fingerprints to a point where they can't be distinguished from others