A lot of people have agreed that the reasoning behind SD/ Psoriasis etc is due to the fact toxins are being excreted in ways which they're not supposed to be. e.g. the Liver can't handle it so it is directed to the skin to remove it, and therefore it causes Psoriasis/SD symptoms
Yeah after you're done on VSL#3 you should just continue to take one probiotic drink daily, that way you shouldn't have the issue of it returning. I've read people have side effects but that's on forums for stuff like Crohns Disease, so It probably wont cause it for you. I'm getting my packet next week from Amazon so hopefully it'll give the final kick to rid my skin.
VSL#3 is pharmaceutical grade level so remember to start slowly; and preferably start on a day where the next day you'll have no plans. E.g. on a Friday, so just in case there are any possible side effects (upset stomach etc)it won't cause too much problems throughout your day.