Papular mycosis fungoides(MF) is a rare presentation of MF. Six illustrative cases of papular MF were retrospectively reviewed. Five of the cases studied by immunohistochemistry had variable numbers(range: 1%-20%) of CD30+ cells in the dermal infiltrate, a finding that is characteristic of lymphomatoid papulosis but may occasionally occur in typical early MF. Although none of our papular MF patients had progressive disease, lesions with relatively high numbers of CD30+ cells in 3 patients did not respond well to skin-directed treatments used for MF. Interestingly, these patients had evidence of coexisting clonal B cell populations in the blood(one with clonal B cell lymphocytosis and two with B-cell chronic lymphocytic leukemia). We conclude that:(1) papular MF may contain CD30+ cells, thereby causing confusion with lymphomatoid papulosis; and(2) papular MF, like more typical MF, may be associated with clonal B-cell proliferations including chronic lymphocytic leukemia. Five of the cases studied by immunohistochemistry had variable numbers (range: 1% -20%) of CD30 + cells in the dermal infiltrate, a finding that is characteristic of lymphomatoid papulosis but may occasionally occur in typical early MF. none none of our papular MF patients had progressive disease, lesions with relatively high numbers of CD30 + cells in 3 patients did not respond well to skin-directed treatments used for MF. Interestingly, these patients had evidence of coexisting clonal B cell populations in the blood (one with clonal B cell lymphocytosis and two with B-cell chronic lymphocytic leukemia). We conclude that: (1) papular MF may contain CD30 + cells, thereby causing confusion with lymphomatoid papulosis; and (2) papular MF, like more typical MF, may be associated with clonal B-cell proliferations including chronic lymphocytic leukemia.