The recording artist revealed his latest body decoration, which covers his entire skull, on the singing competition series Monday night.
Although this artwork is temporary, Green has numerous permanent tattoos, E! News said.
"I think that the tree on my back gave me the most pain," Green told Q magazine in 2011.
"When you get your arms done ... if you can see what's going on, then maybe, psychologically, you think you can control it," he said. "Apparently you can because it doesn't hurt so bad. With your back, you're lying on your front getting the tattoo and you just feel totally out of control. You can't get a gauge on whether they're close to completion, so I gave up on it and I have an unfinished tattoo on my back. It was meant to be a family tree; I haven't been in a rush to finish it."