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Melanocytic lesion analysis is one of the most difficult areas in modern dermatology. The challenges fall into two broad categories, namely, the recognition of rare but characteristic entities and the much more common problem of where to place an unusual lesion on the spectrum of melanocytic lesions. Examples of melanocytic lesions: (a) melanoma in situ, (b) dermal nevus, Unna type, and (c) early invasive melanoma.
