My "cause" hypothesis and hope for the next generation

Merry Christmas Wendy, may I put my pennyworth into your hypothesis? Psoriasis is only one of many autoimmune diseases and I have read many articles ,papers etc on the subject but they all end in the phrase "We do not know what causes Psoriasis yet" I do not recall any references to specific blood groups being more likely to develop any particular type of the disease or if an unborn baby can present with skin symptoms. My question is If vitamins and minerals are helping in treatment , could lack of same in early development be a factor as most sufferers seem to develop it after infancy?