A wide-spread flagellate dermatitis.

A 45-year-old gentleman presented with an intensely itchy, widespread eruption which had been present for 5 days. He was otherwise fit and well. On examination there was a florid, erythematous, papular, flagellate rash over the trunk and limbs. The gentleman had eaten shiitake mushrooms 10 days earlier. The diagnosis was shiitake dermatitis and the rash settled spontaneously.