Iron metallic discoloration
Encyclopedia
Iron metallic discoloration occurred more frequently in the past when soluble iron
Iron
Iron is a chemical element with the symbol Fe and atomic number 26. It is a metal in the first transition series. It is the most common element forming the planet Earth as a whole, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust...

 compounds were used in the treatment of allergic contact and other dermatitis
Dermatitis
-Etymology:Dermatitis derives from Greek derma "skin" + -itis "inflammation" and genetic disorder.-Terminology:There are several different types of dermatitis. The different kinds usually have in common an allergic reaction to specific allergens. The term may describe eczema, which is also called...

, and in eroded areas iron was sometimes deposited in the skin, like a tattoo .
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