Yeah, I agree. If we knew what caused this, we'd have a far better chance of finding something to sort it. I think the way that we all attribute our EC to different things may affect the cure as well. For example, people with a history of biting might need a different treatment to those who put it down to something else.
It's strange how you've said before that your Fordyce's Spots or whatever are only in healed parts. Mine are located only where the skin peels or just above. Similar to #92305s who also took loads of vitamins just before his EC started.
Low concentration Tetrinoin for me next I think. Try and unblock these blocked glands causing the Fordyce's Spots. Unblock the glands which are filled with hardened sebum which doesn't allow the skin's "water-proofing" stuff (Can't be arsed looking up what the word is) to get to the outer layer. Seems logical to me.