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The number of nickel allergies has recently increased dramatically because of the popularity of body piercings. The reason is obvious: a nickel-containing object is in constant contact with the body. Piercing any body part results in some bleeding. Blood contains electrolytes, which can oxidize nickel in the studs or hoops, releasing nickel ions. The ions then have easy access, through the new wound, into the body. Soft tissue, like that in the earlobes, heals quickly because it does not have a lot of blood flow.
It sounds strange, but it’s true: an earring can cause you to develop blisters or break out in a rash. What’s in your jewellery that causes the problem? Why can some people who react badly to white gold happily wear 18-karat yellow gold? The answer is nickel—a metal that is present in varying amounts in most metals used for jewellery (Figure 1). The symptoms of a nickel allergy (also known as nickel contact dermatitis) can be water blisters and a rash at the site of contact or all over the body.