Are you sure it was from olive leaf? I didn't see rash as a side effect, but anything is possible. Probably the best test is try it again and see if the same thing occurs (you might try a lesser dosage). It's actually supposed to be good for allergies, but we are all different.
I hope the horopito works for you; it seems like you are on the right track regarding the cause of Acne because the anti-candida substances have worked for you.
Also, I had an ulcer once that was cured with "dgl licorice" from the health food store...I wonder if that could help heal your leaky gut?