In this book, the author presents a collection of 100 skin diseases and shares an invaluable record of his diagnoses and treatment strategies. This book will serve as a comprehensive and practical companion, expertly guiding readers through the identification of a diverse spectrum of common dermatological conditions typically encountered within dermatology clinics. A beauty of this book is the abundant clinical photography accompanying each case, providing visual context that enhances the reader's understanding of the presented skin diseases. For those who are seeking a guide for clinical practice, training, or a deeper understanding of dermatology, this book will be an efficient and practical reference. The translation was done with the help of artificial intelligence. A subsequent human revision was done primarily in terms of content. This book is a translation of an original Korean edition. The translation was done with the help of artificial intelligence (machine translation by the service DeepL.com). A subsequent human revision was done primarily in terms of content, so that the book will read stylistically differently from a conventional translation. .