Perhaps it is a wound for you. I think we can at least agree that we both believe that there are more than one cause for what's going on here. Many different conditions have the same or similar symptoms so I think we can say that's probably true. You said yours was caused by biting your lip during a stressful period in your life, right? I can relate to the stress from school, but I was never a biter, licker, or anything like that, so I think mine is an allergy. We're probably just two people with similar symptoms and different causes. This is what I think makes general progress so difficult with this.