A man went to the emergency room with an itchy rash that covered his back and kept him up at night. He was diagnosed with shiitake dermatitis, a rare condition that looks like red whip marks. The rash ...

The patient was an elderly Caucasian man who came to the clinic with complaints of a red, intensely itchy rash on his elbows (Figure 1), buttocks (Figure 2), and back. His symptoms began with a slight ...