This book offers readers details in application of high-frequency ultrasound in dermatology, a new method playing increasingly important roles in diagnosis of skin diseases. At first, chapters introduce anatomy and ultrasound features of normal skin. Then terminology, image quality, and artifact of dermatologic ultrasound are presented. After that, ultrasound features of benign and malignant skin tumors, inflammation, autoimmune disease, and traumas are described with diagnostic tips for specific disease. It will be a valuable reference book not only for dermatologist and radiologist, but also for plastic surgeon and cosmetologist.