Background: Dermatoscopy has become a widely used technique for diagnosis of pigmented lesions of the skin. Beginners in dermatoscopy often are confused by the lack of precise, repeatable criteria and opaque terminology. Objectives: To analyze conventional nomenclature of dermatoscopy and to create a system based on terms defined clearly. Patients/Methods: Review of conventional nomenclature in dermatoscopy and of numerous dermatoscopic images of lesions in the skin. Results: Conventional descriptions of structures observed by dermatoscopy employ images that do not correspond to those in the brain of most viewers. A new algorithmic method based on patterns created by simple geometric elements is suggested. Conclusions: The new method suggested here is utilizable for every morphologic aspect of dermatoscopy. It should facilitate application of dermatoscopy and enhance capability for teaching it.