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. 2021 Jan 11;11:282. doi: 10.1038/s41598-020-78233-1

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Trichoscopy of patient with erythrodermic CTCL. (a) The characteristic trichoscopic features visible on this image are: pili torti (blue arrows), thick white bands localized interfollicularly (green arrow) and perifollicular arrangement of linear vessels (red arrows)(× 20). (b) Vessels perifollicular arrangement can be easily recognized (red arrows). Short linear vessels are seen around yellow dots (empty follicular openings field with keratin mass and sebum)(× 70). (c) Numerous pili torti are marked with blue arrows. Additional feature seen if trichoscopy is performed without immersion fluid is follicular spicules-like scaling (green arrows)(× 20). (d) Short broken hairs are marked with blue arrows, perifollicular vessels arrangement with red arrows and patchy brownish discoloration of background with green arrow (× 20).