Is there a systemic version of retin a (tretinoin) or something similar?

Yes: If you are referring to an oral version of retinoic acid, it does exist. But it has important teratogenic potential, which means you should be very sure, before taking it, that you are not and will not want to get pregnant for some significant period of time since it can be very harmful to babies. Consult your dr, ask for safer med trials for your condition before considering its use.