Those cystic zits were already in the making. I too get them. They will not develop overnight from using this or any makeup. They come from dead skin cells and sebacious oils. My dermatologist recommends coming in for a cortisone injection for them, they go away in 1-2 days. NEVER have I had a problem with Bare Minerals doing anything to me. I sleep in it all the time. All the ingredients ARE pure, they all come from the Earth, even bismuth oxychloride!There isn't any false advertising. I highly doubt it is the first time you came across that ingredient. ALL makeup contains it. I'm sure you're one of those critical people anyway. NOTHING ever is up to your standards!!