I'm an Australian who ate almost half a cup of raw shiitakes. I have come down with shiitake dermatitis and it is everywhere! Hair, neck, back, stomach, buttocks, groin area, legs, arms - no-where has been spared! Antihistamines simply do not work! One week later and it seems to be spreading rather than getting better! I am going to get some Calamine lotion after reading one readers post but doctors seem to have no idea how to treat this and there is little literature about it.