In response to a question you posed in your original post...

Never ignore something that may be bothering you and that you'd like to stop. Yes, some behaviours can be more OCD tendencies than active self-injury but it's a matter of degree and intent.

Like me, for instance. I've dealt with self-injury (cutting, scratching etc) but I've also dealt with more obsessive acts - like dermatillomania (compulsive skin picking). So for me, when I was cutting it was a deliberate act, I wanted the pain and to see blood. When I compulsively pick at my fingers or bite the skin on my lips though - I'm not doing it for pain, I'm doing it because some part of my brain feels driven to do it. (I also tend to have less control over biting my lip than deliberately going to find something to self-injure with).

There is a large overlap sometimes between OCD type disorders and related actions in self injury. A good option if you're interested in exploring why you do it and how to stop it (because trust me, biting your lips too much will leave you open to nasty things - like cold sores - and your lips don't heal nicely!) would be to find a therapist/psychiatrist/counselor to talk to about this. Take care!