[Gaius]

Habits are harder to break than actions because they are unconscious. But if I can condition myself to have frequent lucid dreams, I think you could condition yourself to avoid picking at your lips. ^^ I'd start with keeping a lip balm handy. You can even start to obsessively apply it, replacing the lip-picking habit with a chapstick-applying habit. At least you won't be hurting yourself any more. :/