These hypersensitivity reactions must be distinguished from lymphocytoma cutis (LC), or cutaneous lymphoid hyperplasia, the stereotypical example of the cutaneous B-cell pseudolymphoma. lymphadenopathy, organomegaly, and the BI 1467335 (PXS 4728A) presence of infiltrating monoclonal B cells having the same immunophenotype as CLL cells but lacking peripheral blood lymphocytosis [1]. The dermatological literature relating to SLL and CLL is usually sparse. We report a case of perniosis-like involvement of the digits in a patient with SLL and review the literature regarding cutaneous manifestations of SLL and CLL. == Case presentation == The patient is an 86-year-old male who presented in 2004 with small nodules on both ears. There was no palpable lymphadenopathy or splenomegaly noted on physical examination. A biopsy of one of these nodules showed widespread infiltration of small, mature lymphoid cells with occasional proliferation centres. Immunohistochemistry revealed the majority of cells to be CD5, CD20 positive and CD 3 and cyclin D1 unfavorable. The peripheral blood showed a white blood cell count (WBC) of 6.9 109/L (410.5), neutrophils 4.44 109/L (2.00-7.00), lymphocytes 1.89 109/L (1.50-4.0), haemoglobin 145 g/L (136170) and platelets 307 109/L (150400). The remainder of the leukocyte differential was unremarkable. A blood smear showed normal appearing lymphocytes with occasional reactive form but no smudge cells or plasmacytoid features. A bone marrow biopsy showed a subtle interstitial small lymphoid infiltration with mature chromatin and no plasmacytoid differentiation constituting less than 20 % of the marrow. Immunophenotyping by flow cytometry performed around the bone marrow confirmed BI 1467335 (PXS 4728A) a lambda monoclonal B-cell proliferation with dim surface immunoglobulin expression and CD5 and CD19 co-expression. CD20 expression was evident but CD10, CD23 and FMC7 staining was absent. Conventional karyotype analysis was not performed, but fluorescence in situ hybridization was unfavorable for the CCND1-IGH fusion gene created by the t(11;14). The findings from the ear lobe biopsy, peripheral blood and bone marrow biopsy were thought to be most consistent with a BI 1467335 (PXS 4728A) diagnosis of SLL. In 2007, the patient developed jaundice and abdominal pain due to choledocholithiasis and eNOS underwent a cholecystectomy. In addition to cholelithiasis, there was a background population of B-lymphocytes co-expressing CD5 and CD20 with no evidence of CD23, CD10 or cylcin D1 expression. A liver biopsy performed the same year to investigate abnormal liver function tests showed marked lymphocytic and plasmacytic infiltration as well as reactive secondary follicles predominately involving the portal tracts, suggestive of autoimmune hepatitis but with an unusual degree of lymphocyte infiltration with the same phenotypic profile as the gallbladder. The patient was treated with azathioprine with a normalization of his liver function assessments and symptoms. He was referred to the British Columbia Cancer Agency in July 2012 because of painful erythematous bulging of the periungual areas of all his fingers (Fig.1, upper panel) and BI 1467335 (PXS 4728A) toes. Physical examination revealed palpable lymphadenopathy in the left anterior cervical chain, the axillae and the left groin, with the largest lymph gland estimated to be one centimeter in best diameter. Splenomegaly was not detected. A biopsy of the affected skin from the right second finger showed a dense and relatively monomorphic infiltration of the superficial and deeper dermis, by small to intermediate sized lymphocytes with condensed chromatin, irregular nuclear contours and minimal cytoplasm (Fig.2, aandb). Immunohistochemistry confirmed the vast majority of the infiltrate to be of B-lymphoid lineage with these cells aberrantly co-expressing CD20 and CD5 (while being Compact disc10-, 23-, 43-, and cyclin D1-adverse) (Fig.2, candd). These features had been commensurate with a low-grade B-cell lymphoma, such as for example little lymphocytic lymphoma. The individual received radiation towards the thumbs and fingers without the significant improvement. The proper third, in Sept 2012 but again with only hook improvement fourth and fifth fingertips were re-irradiated. A serum proteins electrophoresis demonstrated a BI 1467335 (PXS 4728A) designated polyclonal IgA and IgG hypergammaglobulinemia, with a standard IgM degree of 0.74 g/L (0.5-2.00). There is a substantial upsurge in the serum viscosity but just a mild upsurge in the liver organ aminotransferase enzymes. == Fig. 1. == Top -panel: Bilateral periungual bloating from the fingertips. Lower -panel: Images from the fingertips after six cycles of chlorambucil and rituximab == Fig. 2. == Micrograph ready from periungual biopsy of correct second finger.a, H&E x.