<prompt> In psoriasis, the following are seen except:Nail changesAhritisCNS involvementSkin involvement  <response>: Psoriasis is characterized by red, scaly, sharply demarcated indurated plaques present paicularly over extensor surfaces and scalp. Nail involvement is seen with all types of psoriasis and is frequently present with psoriatic ahropathy. An inflammatory ahritis is associated with psoriasis of skin andor nails with a negative serological test. CNS involvement is not seen with psoriasis. 