Errrrm, no
PROLONGED contact against SWEATY skin.
Also, fingertips are a whole lot less prone to such reactions. I play bass, the strings of which contain nickel, but never have a finger rash. However, a nickel alloy watch backplate will bring my wrist out in lumps in no time.
Maybe if someone held coins in their sweaty mitts all day, they would get a reaction (in the palms more likely)


