You may be allergic to your mineral powder makeup because of Bismuth

bismuth oxychloride. The standard primary ingredient (I believe it is the 2nd ingredient listed in Bare Escentuals Mineral Powder foundations, etc.)  included in most powders that are referred to as “mineral makeup.” The claim for bismuth oxychloride is that it is all-natural and better for skin than talc. In fact, in many ways talc is a more natural, unadulterated, pure ingredient than bismuth oxychloride. Bismuth oxychloride, which seldom occurs in nature, is manufactured by combining bismuth, a by-product of lead and copper metal refining, with chloride (chlorine compound) and water. It’s used in cosmetics because it has a distinct shimmery, pearlescent appearance and a fine white powder texture that adheres well to skin. Bismuth oxychloride is heavier than talc. Pure bismuth is a naturally occurring, grayish-white powder. It and its derivatives are used as skin protectives, thickeners, and absorbent agents. Bismuth oxychloride was permanently listed by the FDA as a coloring agent in 1977 and as a synthetic ingredient (Source: The International Cosmetic Ingredient Dictionary and Handbook, Eleventh Edition, 2006).