“In a study published in the journal Scientific Reports on Tuesday, a team of French and German researchers reports that nanoparticles found in some tattoo inks can migrate away from the skin — and accumulate in lymph nodes.”
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Schreiver, I., Hesse, B., Seim, C. et al. Synchrotron-based ν-XRF mapping and μ-FTIR microscopy enable to look into the fate and effects of tattoo pigments in human skin. Sci Rep 7, 11395 (2017). https://doi.org/10.1038/s41598-017-11721-z