This book is about Psoriasis and Psoriatic Arthritis and is most relevant to the first responders in a clinical setting. It provides comprehensive and in-depth coverage of disease pathogenesis, salient clincal features, diagnosis, complications and treatment in a simplified manner. This compilation of contemporary knowledge will benefit the novice in building expertise and benefit experienced practitioners also by providing nuanced insights. We hope this book will be of use to any medical professional who, as first responder, deals with the patients. The language has been kept very simple and made interesting for the reader.