Blastic Plasmacytoid Dendritic Cell Neoplasia (BPDCN) is a rare hematological malignancy whose pathogenesis has not yet been elucidated. Skin, bone marrow, and lymph node involvement can be observed, it generally seen in men old adults. Immunohistochemistry (IHC) features of skin marrow biopsy are essential for diagnosis. There no standardized treatment options this malignancy, the prognosis pa...