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特許 係属中 Psoriasis /sɵˈraɪ.əsɨs/ is a long lasting disease characterized by patches of abnormal skin.[1] These skin patches are typically red, itchy, and scaly. They may vary in severity from small and localized to complete body coverage.[2] Injury to the skin can trigger psoriatic skin changes at that spot, which is known as Koebner phenomenon.