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      Pseudolymphomatous Folliculitis: A Distinctive Cutaneous Lymphoid Hyperplasia

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          Abstract

          Pseudolymphomatous folliculitis (PLF) was first described in 1986 as a distinct variant of pseudolymphoma, characterized by a dense lymphoid infiltrate and accompanied by hyperplastic hair follicles. Here in we report a case of PLF presenting as an erythematous plaque with pustules and satellite lesions on forehead in an otherwise healthy adult male patient.

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          Pseudolymphomatous folliculitis: a clinicopathologic study of 15 cases of cutaneous pseudolymphoma with follicular invasion.

          H Okubo, Andrew E. Arai, I Katayama … (1999)
          We report the clinical, histopathologic, and immunohistologic features of 15 cases of pseudolymphomatous folliculitis (PLF). The patients comprised seven males and eight females (mean age, 38.6 years; age range, 2-67 years). All patients had dome-shaped or flat-elevated nodules suggestive of cutaneous lymphoid hyperplasias (CLHs). The lesions were solitary in all 15 cases, except in one case with duplex lesions. All lesions were located on the face and measured less than 1.5 cm. In 14 cases with one lesion each, five lesions showed rapid regression after incisional biopsy, whereas the remaining nine underwent excisional biopsy. In the case with duplex lesions, one regressed spontaneously after excisional biopsy of the other. Histopathologically, all PLFs showed dense lymphocytic infiltrates from the dermis to the subcutis simulating cutaneous lymphomas. The walls of hair follicles in all cases were enlarged and irregularly deformed with their epithelium blurred by lymphocytic infiltrates; we called this change "activation" of hair follicles. In nine cases, many atypical lymphocytes were intermingled; three of these cases had been misdiagnosed as cutaneous T-cell lymphoma at other institutions. Immunohistologically, 10 and 5 cases showed predominantly B cells and predominantly T cells, respectively. Remarkably, all lesions showed increased numbers of perifollicular histiocytes expressing anti-S-100 protein and CD1a, and seven lesions showed histiocytes in aggregates. We conclude that PLF is a subset of CLH with characteristic clinical and pathologic features showing perifollicular clustering of T-cell-associated dendritic cells with activation of pilosebaceous units. PLF is an entity to be differentiated from malignant lymphomas and other cutaneous pseudolymphomas.
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            Pseudolymphomatous Folliculitis on the Nose

            Aya Kakizaki, Taku Fujimura, Ikuko Numata … (2012)
            Pseudolymphomatous folliculitis (PLF), which sometimes mimicks cutaneous lymphoma, is a rare manifestation of cutaneous pseudolymphoma and cutaneous lymphoid hyperplasia. We describe a 57-year-old Japanese woman with PLF on the nose that resembled cutaneous lymphoma clinically. The biopsy specimen revealed dense lymphocytes, especially CD1a+ cells, infiltrated around the hair follicles. Without any additional treatment, her nodule rapidly decreased before we performed a second biopsy for analysis of the clonal gene rearrangement. Though PLF typically behaves as benign lymphohyperplasia, differentiation from cutaneous lymphoma is necessary.
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              A case of pseudolymphomatous folliculitis.

              J. Choi, S. U. Ahn, Yeseon Moon … (2006)
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                Author and article information

                Journal
                Journal ID (nlm-ta): Indian J Dermatol
                Journal ID (iso-abbrev): Indian J Dermatol
                Journal ID (publisher-id): IJD
                Title: Indian Journal of Dermatology
                Publisher: Medknow Publications & Media Pvt Ltd (India )
                ISSN (Print): 0019-5154
                ISSN (Electronic): 1998-3611
                Publication date (Print): Jul-Aug 2013
                Volume: 58
                Issue: 4
                Pages: 278-280
                Affiliations
                [1] From the Department of Dermatology, Dr. L. H. Hiranandani Hospital, Powai, Mumbai, India
                Author notes
                Address for correspondence: Dr. Rameshwar M. Gutte, Department of Dermatology, OPD No. 112, 1 st Floor, Dr. L. H. Hiranandani Hospital, Powai, Mumbai - 400 076, India. E-mail: drrameshwargutte@ 123456yahoo.com
                Article
                Publisher ID: IJD-58-278
                DOI: 10.4103/0019-5154.113937
                PMC ID: 3726873
                PubMed ID: 23918997
                SO-VID: 7f3043b7-516f-4f97-b8a1-0ce3174cd78c
                Copyright © Copyright: © Indian Journal of Dermatology
                License:

                This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : July 2012
                Date accepted : December 2012
                Categories
                Subject: Dermatopathology Round

                ScienceOpen disciplines: Dermatology
                Keywords: forehead,lymphoma,pseudolymphomatous folliculitis
                Data availability:
                ScienceOpen disciplines: Dermatology
                Keywords: forehead, lymphoma, pseudolymphomatous folliculitis

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