An itchy rash on a man's hand

A 37-year-old man without a significant past medical history presents to the dermatology clinic with an itchy rash on his right hand that he has had for about 4 months. He had tried numerous over-the-counter hand creams and hydrocortisone cream with no improvement. Additional questioning revealed a 1-year-history of dry, itchy feet. As a construction worker, he wears occlusive, steel-toed ...