Psoriasis is described as a skin disease recognized by red, scaly, itchy patches. By virtue of the dynamic nature of the scientific procedure, the elucidation of the type, pathogenesis and treatment of a disease always remain work under progress. The complex nature of any disease can likewise be revealed by comprehending the historical context of our present understanding, analyzing general hypotheses, and extrapolating horizons for novel research. The aim of this book is to elucidate the causes, treatments and types of this disease. This approach might considerably enhance the transference of disease knowledge for physicians and thus, enhance the quality of medical services advocating training of excellence and evaluating the qualifications of physicians, majority of whom are not much aware about clinical dermatological practices.