To create a dermoscopic classification of atypical melanocytic nevi (Clark nevi) and to investigate whether individuals bear a predominant type.Design: Digital dermoscopic images of Clark nevi were classified according to structural features, ie, reticular, globular, or homogeneous patterns or combinations of these types. The nevi were also characterized as central hypopigmented or hyperpigmented, eccentric peripheral hypopigmented or hyperpigmented, or multifocal hypopigmented or hyperpigmented. Setting: Two pigmented skin lesion clinics. Patients: We examined 829 Clark nevi on 23 individuals. Main Outcome Measure: A reliable dermoscopic classification of Clark nevi and frequency of different dermoscopic types.