Itchy skin without a rash can be an annoying problem ... tingling, or burning in the forearms, shoulder, or upper back.

A 50-year-old man presents to your office complaining of an itchy, worsening rash on his wrists and ankles ... slightly scaly papules on his wrists and forearms. His buccal mucosa exhibits white ...

So you've enjoyed a picnic in the sunshine. Or you've sat on the grass for a twilight concert. But you've come away with ...