I'm going to correct something about/ add some to my previous post.
I said in another post that, although it's not plausible that EC is wound that lasts for decades, for some people repetitive skin picking/licking/rubbing might have caused some autoimmune inflammatory response.
Well, I think it is plausible that for some people skin picking/biting/licking might have resulted in a form of hyperkeratosis. This post from 11 years ago was really informative about this: //www.curezone.org/forums/fm.asp?i=726706#i