How do I remove this bump on my lip?

I bit my lip about 2 years ago. I ended up with a bump that won't go away. I have been to a dermatologist and a plastic surgeon. Both tried razoring it off but within 3 months the bump was back. I'm losing hope as to what this is and if there is a way of removing it. It does not hurt but it is very annoying and not aesthetically pleasing. Any help would be greatly appreciated! Thank you!