 [ Symptoms ] can cats cause psoriasis my father has sever psoriasis on his back arms and legs he has never had skin conditions of any type until the past 10 years and he is now 70 my step mother has became a cat hoarder and the psoriasis began about the same time as the hoarding we have narrowed down the cat population to about 10 however my father still has psoriasis he has been to the dr and had prescriptions that do little to offer relief [ Disease ] the causes of psoriasis is really unknown i can vindicate the cats as a cause however cats can cause allergic responses to the skin but cats do not cause psoriasis