Medical News Today -- Patients with psoriasis have a higher risk of developing depression or anxiety, and having suicidal feelings, says a report published today in Archives of Dermatology, a JAMA/Archives (Journal of the American Medical Association) journal. Psoriasis is a dry, scaly skin disorder. Doctors believe that it is genetic and is caused by the immune system being mistakenly “triggered”, resulting in skin cells being produced too quickly.