Psoriasis is a long-lasting autoimmune disease characterized by patches of abnormal skin. These skin patches are typically red, dry, itchy, and scaly. On people with darker skin the patches may be purple in colour. Psoriasis varies in severity from small, localized patches to complete body coverage
treatment includes Steroid creams, vitamin D3 cream, ultraviolet light, immune system suppressing medications such as methotrexate