My son, who I feel has mercury issues, gets red in the face - kind of a blotchy red. I am not sure it is fatigue that does it. It is not blushing because it is not during an embarassing moment or anything like that, and also, he does not experience heat with it - he doesn't even realize that he has turned red. He also gets red hands - on the back of his hands, not the palms. But I don't know any more than you as to its cause. <img src="/ubbthreads/images/graemlins/confused.gif" alt="" />