Ultrasound in Dermatology: Why, How, and When?

Nowadays, there are several applications of ultrasound in the field of dermatology, and the numbers continue to grow. This imaging technique can allow the study of the skin, the nail, and even the hair. The objective of this review is to provide an insight into the reasons for performing this examination, including technical considerations, the sonographic anatomy, and to discuss the sonographic characteristics of common dermatologic entities.