My Husband Has Psoriasis And Don't Know If It Ties

my husband has psoriasis and don't know if it ties into these other symptoms but at times when he sits in a chair, his toes turn blue and he feels like needles are poking him at least once a day if not more. he is 45 blood pressure is good. He had a CBC and levels were good. Were going to seek help just wondering what it may be. I've researched and there's multiple thing it could be