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A variety of factors -- ranging from emotional stress and trauma to streptococcal infection -- can cause an episode of psoriasis. Recent research indicates that some abnormality in the immune system is the key cause of psoriasis.
At this time, it is not known what causes plaque psoriasis. What experts do know is there's a link between the immune system, genetics and plaque psoriasis. The majority of researchers conclude that with plaque psoriasis, the immune system is triggered in error.t this time, it is not known what causes plaque psoriasis. What experts do know is there's a link between the immune system, genetics and plaque psoriasis. The majority of researchers conclude that with plaque psoriasis, the immune system is triggered in error.