Hi, I know you posted this a while ago but I have only just read it. I also have this metallic tasting blood! I have mentioned it to my mum and doctor in the past (who both think i am mad) it tastes different to when i was young (before psoriasis). I have had a hair analysis test in the past and have extremely high magnesium levels but i am unsure how that would effect anything. The metallic taste could be copper- i am going to look into copper excess and see what I can find.
I am 26 and have had psoriasis for 10 years..it has got much better since I stopped smoking 2 years ago but it is not completely cleared.I have strong beliefs it can be fully cleared and is not genetic as it constantly changes.