Nickel maybe: It's common for people with nickel allergy to have an itchy rash near the belly button (umbilicus) due to the snap on blue jeans or belt buckle. Similar rash on wrists can be due to watches, bracelets, etc. A dermatologist or allergist can assess for contact dermatitis including to nickel with a skin test called a patch test.
Answered 4/22/2013
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