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 3,000 to 5,000 years ago, through the mid-ages, the renaissance, the nineteenth and the twentieth centuries till the current day and age.