Psoriasis is described as a skin disease recognized by red scaly itchy patches. The aim of this book is to provide a descriptive analysis of Psoriasis a disease that affects approximately 2-3% of humankind across every nation. Occurrence of psoriasis has been examined since the times of clay tablets of Assyrians and Babylonians 3000 to 5000 years ago through the mid-ages the renaissance the nineteenth and the twentieth centuries till the current day and age.