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Well, I remember back in the days boys and girls used to ask their idols to sign them on their skins and they tried not to wash the specific place for a long time. I also remember a Roald Dahl story where a beggar had a tattoed painting on his chest, by a very famous and expensive painter. You should read it, I ain't going to spoil it for you, it is fantastic!
In that fictional story they actually did! And reality is stranger than fiction!
Do they auction for him? And afterwards his skin ends up in a gallery? If yes, it might be inspired by the story! Dahl is a genious. Not only his famous children books, but his strange short stories as well. In the movie "Four rooms" the final story with Tarantino comes from a Dahl short story.