Hi mate, I started biting my lip at the age of 12 and did not stop untill I was about 24, all the time thinking that when I stopped I would just have to wait a few weeks for them to heal! boy how I was wrong!.
Nearly 29 now and they have have got better since the day I stopped biting, i.e the first time they scabbed up they looked green/yellow and very thick scab which was glued to my lip.
Now they scab up slower and don't go green/yellow. This has been very hard to get to this stage, I just think you have got to give your body time to remember how the lips were originaly. I have pretty much sacfraficed my social life for this as many of us have on here, u just got to be strong and have loads of will power and hope. I have been leaving my lips alone and not touching them until the scab is ready to come off. I have only really forced it when something importatnt comes up, like a wedding or birthday.
Also it must depend on how long we have abused our lips ( for lip biters that is ).