Pretty much everywhere... my arms and legs are the worst.
I use a medicated cream that the allergist gave me, and Aveeno products for everything (even shaving cream and face wash). He also gave me Elidel cream but effects the long term use of that haven't been established yet so I use it sparingly.
I use a Band-Aid to cover up the back of the button on my jeans (nickel). ALL gold, no matter the purity, has nickel in it, so I've been looking into replacing my wedding set with a platinum band. I don't wear a watch any more. I don't wear earrings.
I take Zyrtec twice a day, because my allergies are so severe. I stay away from things (fabrics) that irritate, like wool and polyester.
Above all, hydration. Water and moisturizer. Lots.