hmm, wow, good luck with that one. I do know some of the patients i work with have scratched their skin in a simple design pattern or initials or something and then rub ink from a pen or marker over the wound and when it heals they do end up with a tattoo like thing. So i am gonna guess the same theory they use may have been what happened to you. I am no expert on tattoos or wounds with ink in them, actually i know little to nothing about them, just only what my patients tell me. Sooo good luck and thanks for sharing your lesson learned.
~violetgem~