Skin Rash

It has been a long time since I have taken Miracle-Mineral-Supplement and I would like to start again for various reasons. However, I quit taking it because I developed a huge rash across my mid section (above the belly button) that itched like crazy. Does anyone have any ideas what would have caused this or what the Miracle-Mineral-Supplement might have been working on? I have lots of issues with food digestion, constipation and gas that I would love to be rid of once and for all.

Thanks for any help!