By modifying the optic characteristics of the skin, the dermatoscope makes it possible to see different shapes or structures that cannot be discerned with the naked eye. These shapes or structures are given a name to identify them. Identifying all these dermoscopic structures is as necessary as recognizing basic dermatologic lesions. The multiple repetitions of a structure form a pattern. When the structures are associated with certain pigmented lesions and their observation implies defining a given lesion, they are called criteria. Besides the structures, different colors can be observed which help elaborate the dermoscopic diagnosis.