< CNMD \ Tutorial Two-Steps Procedure for the Dermoscopic Classification of Pigmented Skin Lesions: A Unifying Concept H.P. Soyer, G. Argenziano, S.W. Menzies, H. Pehamberger, H. Rabinovitz, W. Stolz First step Differentiation between Melanocytic and Non-melanocytic Lesions Second step Differentiation between Benign Melanocytic Lesions and Melanoma