I called a plastic surgeon I know and asked for you (I know, how LA!)
He's an open-minded person who I'm personally friends with, and prescribed these acne drugs a lot. He said that you will still be able to enjoy MDMA, but the MDMA may weaken the effects of your prescription on your acne. He's not aware of any true added risks with this combination.
I'd research the topic as much as you can- he's not an expert on MDMA reactions, just a doctor who's fairly informed about it.