I don't know how every elses EC started, but mine started out of nowhere with a small line on my bottom lip, which eventually grew to almost my whole bottom lip and big parts of my top lip. It just doesn't make sense to be any kind of wound. If the lip skin was damaged in any way, I would have noticed it earlier. My lip skin was always fine, no flakes, no peeling, no pain, no inflammation, just feeling a little dry, which is why I used chapstick and other things. And then from one day to the next, EC came out of the blue and then kept spreading over 3-4 months, even with me leaving them alone and not putting anything on them. If it was a wound if should have eventually stopped spreading. But it just went its way without me being able to do anything about it.
Well, I guess I forgot what I was trying to say... :-D I will probably keep leaving them alone for another 7 weeks or so (I'm already 4 months into it and seem to have no sign of progress whatsoever). If I don't notice improvement by then, I will probably stop and start treating it (with my derm) as atopic eczema or psoriasis.