I have found that silica is the best thing for treating severe excema or psorisis. I have suffered most of my life with psorisis (or excema as it was once diagnosed). When I began to supplement with Iodine , magnesium, selenium and vitamin C, the excema cleared from most of my body, but never actually disappeared, I was still getting break outs of it.
I began to supplement with silica for a damaged knee joint, (which is now completely pain and swelling free), and one of the side effects of this has been the complete disappearance of the excema(psorisis), from my entire body. After 2 months on the silica supplement I have not seen any return of the excema.
It is now my belief that excema or psorisis is a form of connective tissue disorder, I have no scientific proof of this, only my observations.
BTW I have experienced all of the benefits that Hv posted as well.