It is traumatic, might be due to irregular teeth or your habit of lip bitting.
First remove the cause, if it due to irregular arrangements of teeth, round off the tooth, that is hurting followed by ortho treatment ( braces or clear aligners)
If due to your habit, please try to avoid it.
It is nothing to worry as of now, but it should be removed / treated immediately
Next Steps
Visit the dentist and discuss the causes as the first step and the proceed with the treatment plan
Avoid disturbing that area
Hope this helps you