SECTION I-The Requisites.- Technical Recommendations, Settings, and Protocols.- Dermatologic Concepts and Terminology.- Ultrasound Concepts and Terminology.- Comprehensive Anatomy of the Normal Skin, Nail, Hair and Adjacent Structures.- Relevant Topographic Anatomy, Anatomical Variants and Risk Zones.- SECTION II-Ultrasound Features of Common Dermatologic Conditions.- Ultrasound of Congenital Cutaneous Conditions.- Ultrasound of Non-Vascular Tumors and Pseudotumors.- Ultrasound of Skin Cancer.- Ultrasound of Vascular Anomalies and Tumors.- Ultrasound of Dermatologic Inflammatory Conditions.- Ultrasound of Common Infections and Infestations.- Ultrasound of Nail Conditions.- Ultrasound in Aesthetics.- Ultrasound in Pediatric Dermatology.- SECTION III- Practicalities.- Tips for Reporting the Examinations.- Tips for Ultrasonographic Marking of the Lesions.