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. 2019 Feb 7;23(2):143–149. doi: 10.1007/s10151-019-01934-x

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 4 — Progression of methylene blue injection. a Typical skin breakdown, maceration, and lichenification. b Immediately after methylene blue injection. c Two-week post-treatment. Tattooing started to disappear after 1–2 weeks. d Four-week post-treatment. After about 4 weeks, only small pin-point areas of tattooing were left. Blue color tattooing remained in the perianal skin (c, d)