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. 2020 Sep 30;10:16169. doi: 10.1038/s41598-020-73149-2

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© The Author(s) 2020

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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Confocal fluorescence endomicroscopy of skin following oral ingestion of fluorescein. Labels indicate times after ingestion. Diffuse fluorescence signals were observed at the arm and wrist, while more structured images were obtained at the fingertip. All images show a field of view with a 240 µm diameter.