I've heard of people trying laser surgery on this with no success.
Just wondering fella if you've noticed any little white dots in the affected area of your lips?
My biggest theory at the moment is that the glands which allow moisture to the outer part of the lip have been blocked by something. On my top lip (Which is where the skin is most problematic) I have loads of white dots which are not really noticeable. I've read on-line that they're meant to be harmless Fordyce's Spots but the definately only came on when the condition did.
People keep telling me that they were probably there before this but I'm very particular about my appearance and would have noticed.