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Vismodegib is a hedgehog pathway inhibitor that has been successful in treating patients with locally advanced BCC. We report a patient with BCC with a good response to vismodegib and a novel xanthomatous change in the excision specimen. Histologic distinction between melanoma ex-blue nevus and cellular blue nevus (CBN) can often be difficult, but features supporting melanoma include infiltrative growth pattern, frequent mitoses, cytologic atypia and pleomorphism, cell crowding, and tumor necrosis. Unfortunately, these features are not con