As you come in contact with some metals, nickel in particular. As the nickel is released onto your skin, it can enter your skin. Your cells take this nickel and give it to your immune system. The more nickel your immunesystem gets shown, the more immune-cells are made to handle that nickel. When you get too much nickel, your immune system reacts and you get a rash.
Also fun fact to add, you cant smell metal. Metal does not evaporate at room temperature. So that metal smell you can smell, is actually the oils of your skin reacting with the metal. Try smelling a coin after handling it. Then wash it off with dishsoap and dry it with a paper or towel, without letting your skin touch it. It wont smell until you touch it again!
Whatever that material is, you have an allergy to it. Often times the culprit is nickel, which is used in really cheap but fancy looking jewelry. Try some of the hypoallergenic ones, see how those work for you, but it’s also entirely possible that you need a solid silver, gold, platinum, titanium, or surgical steel jewelry. On sunglasses it’s harder, but you can paint clear nail polish over the metal bits to give a buffer between it and your skin.
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