{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T13:24:05Z","timestamp":1787837045244,"version":"build-2784847793"},"reference-count":64,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T00:00:00Z","timestamp":1787788800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T00:00:00Z","timestamp":1787788800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Histopathology"],"abstract":"<jats:p>Primary cutaneous lymphomas (CL) and lymphoproliferative disorders (LPD) are heterogeneous T\u2010 and B\u2010cell neoplasms defined by integrated clinical, histopathological, immunophenotypic and genetic criteria. The 5th edition of the WHO classifications of haematolymphoid and skin tumours and the International Consensus Classification incorporate recent clinicopathological and molecular advances. Formerly provisional entities, including primary cutaneous small or medium CD4+ T\u2010cell LPD, primary cutaneous gamma\/delta T\u2010cell lymphoma, primary cutaneous CD8+ aggressive epidermotropic cytotoxic T\u2010cell lymphoma and Epstein\u2010Barr virus\u2010positive mucocutaneous ulcer, are now established, whereas primary cutaneous CD8+ acral T\u2010cell lymphoma has been renamed primary cutaneous CD8+ acral T\u2010cell LPD because of its excellent prognosis. The WHO classification additionally recognizes primary cutaneous peripheral T\u2010cell lymphoma, not otherwise specified and reactive T\u2010 and B\u2010cell\u2010rich lymphoid proliferations. This review summarizes current developments in mycosis fungoides, primary cutaneous CD30\u2010positive LPD, other cutaneous T\u2010cell lymphomas, cutaneous B\u2010cell lymphomas and reactive lymphoid proliferations. Emphasis is placed on diagnostic pitfalls, clinicopathological correlation, emerging immunohistochemical and molecular markers, T\u2010cell receptor sequencing, artificial intelligence\u2010based diagnostic support and clinically relevant genetic alterations. Particular attention is given to the distinction of indolent lymphoproliferations from aggressive lymphoma and from reactive mimics, as this distinction directly influences staging, treatment intensity and patient counselling. Recent data on transformation, gamma\/delta phenotypes, CD30 expression, cutaneous B\u2010cell lymphoma biology and EBV\u2010associated lesions are also integrated. The revised classifications underscore that diagnosis of CL should not rely on morphology, immunophenotype or molecular findings alone, but on synoptic integration of all available data to avoid overdiagnosis, underdiagnosis and unnecessary therapy.<\/jats:p>","DOI":"10.1111\/his.70269","type":"journal-article","created":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T13:11:42Z","timestamp":1787836302000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Cutaneous lymphomas \u2013 an update"],"prefix":"10.1111","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6552-8629","authenticated-orcid":false,"given":"Werner","family":"Kempf","sequence":"first","affiliation":[{"name":"Kempf und Pfaltz Histologische Diagnostik  Zurich Switzerland"},{"name":"Department of Dermatology University Hospital Zurich  Zurich Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0971-0370","authenticated-orcid":false,"given":"Christina","family":"Mitteldorf","sequence":"additional","affiliation":[{"name":"Department of Dermatology, Venereology and Allergology University Medical Center G\u00f6ttingen  G\u00f6ttingen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,27]]},"reference":[{"key":"e_1_2_12_2_1","volume-title":"Haematolymphoid Tumours","author":"WHO Classification of Tumours Editorial Board","year":"2024"},{"key":"e_1_2_12_3_1","volume-title":"Skin Tumours","author":"WHO Classification of Tumours Editorial Board","year":"2024"},{"key":"e_1_2_12_4_1","doi-asserted-by":"crossref","first-page":"1229","DOI":"10.1182\/blood.2022015851","article-title":"The international consensus classification of mature lymphoid neoplasms: a report from the clinical advisory committee","volume":"140","author":"Campo E","year":"2022","journal-title":"Blood"},{"key":"e_1_2_12_5_1","doi-asserted-by":"crossref","first-page":"1491","DOI":"10.1111\/jdv.19987","article-title":"Classifications of cutaneous lymphomas and lymphoproliferative disorders: an update from the EORTC cutaneous lymphoma histopathology group","volume":"38","author":"Kempf W","year":"2024","journal-title":"J. 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