20.500.12556/DiRROS-29915 Pityriasis lichenoides an university department long-term follow-up study Introduction: Pityriasis lichenoides (PL) predominantly affects children and young adults. Its etiology is unclear, and the condition ranges from a harmless inflammatory disease to possible progression or pre-manifestation of cutaneous T-cell lymphoma. Methods: A long-term cohort included 242 patients with PL of all age groups diagnosed and treated at our department from 2009 to 2019. Follow-up lasted until 2024. We analyzed the disease duration, demographic and clinical features, and outcomes in our patients. Results: The cohort of PL patients studied included 107 adults and 135 children. A total of 221/242 (91%) patients were followed for 5 to 15 years (the median follow-up period was 9.9 years). No statistically significant difference (p > 0.05) in disease duration or lesion distribution was found between different PL forms in children or adults. The results show a male-to-female ratio of 1.7:1 for pediatric patients and 0.6:1 for adults, with a higher incidence of male patients among children (p < 0.01). During the follow-up period, no progression to cutaneous T-cell lymphoma was established. Conclusions: PL encompasses a spectrum of papulosquamous disorders with male predominance among children and female predominance in adults. In addition, the study results underscore the benign course of PL. inflammatory disease pityriasis lichenoides polymorphous inflammatory disease pruritus rare skin disease vnetna bolezen Mucha-Habermannova bolezen polimorfna vnetna bolezen pruritus redka kožna bolezen izpuščaji true false true Združenje slovenskih dermatovenerologov Angleški jezik Slovenski jezik Na spletni strani revije navedeno: Acta Dermatovenerologica Alpina, Pannonica et Adriatica (ISSN 1318-4458) is an open access medical journal published quarterly by the Association of Slovenian Dermatovenerologists (https://acta-apa.mf.uni-lj.si/index.php); Authors publishing in our journal retain copyright of their work under the Creative Commons Attribution License (CC BY 4.0). This license allows unrestricted use, distribution, and reproduction of the work in any medium, provided the original author(s) and copyright holder(s) are appropriately credited, and the original publication in the journal is properly cited, following established academic practices (https://acta-apa.mf.uni-lj.si/submissions.php). Neznano 2026-06-09 08:38:23 2026-06-11 13:21:01 2026-07-05 22:57:59 0000-00-00 00:00:00 2025 0 Ljubljana 0 str. 189-191 issue 4 Vol. 34 Dec. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-08-28 2025-12-06 0000-00-00 616.8-009.613.7 1318-4458 10.15570/actaapa.2025.34 276704003 actaapa.2025.34.pdf actaapa.2025.34.pdf http://dx.doi.org/10.15570/actaapa.2025.34 1 FC988A7DD05EF36B1F1E6887724732FE 8c3cf30aa3fb5a32c05b166b33fd53c5bbcbc407d7ddd943c2ba123991e31f08 3da0177c-6586-11f1-9215-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=45230 https://acta-apa.mf.uni-lj.si/journals/acta-dermatovenerol-apa/papers/10.15570/actaapa.2025.34/actaapa.2025.34.pdf 0 398715fc-6ae1-11f1-be3d-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=45879 Združenje slovenskih dermatovenerologov Acta dermatovenerologica Alpina, Panonica et Adriatica 0 0 0