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Patent Granted Psoriasis (/sɵˈraɪ.əsɨs/; from Greek ψωρίασις, meaning "itching condition" or "being itchy",[1] from psora, "itch" and -sis, "action, condition"; also termed psoriasis vulgaris)[2] is a common, chronic, relapsing/remitting, immune-mediated systemic disease characterized by skin lesions including red, scaly patches, papules, and plaques, which usually itch.