shiitake dermatitis
flagellate mushroom dermatitis,
flagellate dermatitis

Shiitake dermatitis, as it’s known in medical jargon, was first described in 1977.

Rarely, consumption of raw or slightly cooked shiitake mushrooms may cause an allergic reaction called "shiitake dermatitis", including an erythematous, micro-papular, streaky pruriginous rash that occurs all over the body including face and scalp, appearing about 24 hours after consumption, possibly worsening by sun exposure and disappearing after 3 to 21 days.