i have a alergey to medals, when i really break out its from a cheap clasp on a real gold or sterling neckless, and the break outs are worst when it hot out and i sweat, lately ive been having a tingling sensation on my back skin, it really bothers me, i am wearing a rope neckless with a clasp that is medal, i paint the clasp with nail polish to try and not break out, but still always have some blisters on my neck, could this tinging on my back have something to do with my alergy to the clasp???????????? please help,, thanx