Interestingly, a similar phenomenon was observed in this case. Regular hairpin vessels are seen in seborrheic keratosis. 1,5 This melanoma was accompanied by senile lentigo, which can be the precursor of seborrheic keratosis. It may be one of the possible mechanisms by which regular hairpin vessels become conspicuous by melanoma. Recently, black-blue color has been reported to be an important dermoscopic clue to recognize nodular melanoma. 2 However, black-blue color was uncertain probably because this case was hypomelanotic melanoma and such a confusing case still may exist. We should keep in mind that typical dermoscopic features of pigmented basal cell carcinomas can be found in melanomas.
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