Background: Peripheral blood plasmacytosis can be seen in plasma cell leukemia (PCL) or plasma cell myeloma (PCM). As plasma cells show dysplasia or lymphocytoid morphology, they masquerade as monocytes or high fluorescent lymphocytes (HFL) on automated cell analyzer. The early suspicion and detection are of clinical importance for diagnostic and prognostic reasons. Methods: Automated cell analyzer was used for routine CBC examination. Peripheral blood smear examination was performed for enumeration and characterization of cells in peripheral blood followed by bone marrow examination and ancillary techniques. Conclusion: Lymphocyte-Monocyte peak with increased high HFL count on CBC should prompt a smear examination of the peripheral blood for circulating plasma cells and immunohistochemistry markers like CD38, CD138, CD56 should be used to establish the clonality in cells.