The hospital has now called police to try to evict Sheng - but he has welcomed the police involvement and asked them to investigate.
"I'm not leaving," he said. "I'm worried that if I go out for even half an hour, the hospital will claim I had the tattoo done outside.
"But even if I wanted a tattoo, I wouldn't want those characters and I wouldn't want it on that part of my body."
The hospital staff blames the marks on a possible allergic reaction. Link -via Dave Barry
Can't find the article anymore. (Everything I can find with Google is a copy of the same story linked here.) An allergic reaction makes a lot more sense, why would the hospital do it on purpose? It's not as if they could expect it to go unnoticed.
Also, I don't know if this is the fault of the photograph, or the actual tattoo itself, but the characters are in mirror-reverse.