In the 21st century, there has been a vast explosion in new information relating to the art and science of dermatology as well as fundamental cutaneous biology. Furthermore, this information is no longer exclusive to the interests of the small, but growing, specialty of dermatology. Clinicians and scientists from a wide variety of disciplines have recognized the broad implications of cutanous lesions in systemic diseases. At present, there is a multidisciplinary and worldwide interest in the progress of dermatology. It is difficult for most fully-booked physicians to spend too much time on searching secondary data for the textbook mentioned; this kind of literature-searching job is very time-consuming and remains somewhat incomplete. It should be very helpful to have textbook-matched handbooks with expanded information from topic-oriented experts. With these factors in mind, we have undertaken this series of books which are specifically oriented toward the advances of dermatology. The scope of the series is purposely broad, with books ranging from pure basic science to practical, applied and clinical dermatology. Thus, while there is something for everyone, all volumes in the series will ultimately prove to be valuable additions to a dermatologist's library. The book consists of 22 chapters prepared by authors from 9 countries between five continents. The organization of this international editorial group has ensured global opinions, avoided regional bias and racial preferences. The topics covered in this book are the core of dermatology: from the fundamental changes of skin biology to newly developed technologies and treatments. What makes this book quite unique is the inclusion of Chinese medicine, telemedicine and biologics.