Jelly Roll has ... and it wasn't until after he got a face tattoo while in jail that other artists agreed to work in the area. "I've gotten staph infections from bad tattoos," he said.

Jelly Roll's body is covered with dozens of tattoos the singer got when he was much younger, but as a 39-year-old, he now regrets getting most of them. The hitmaker, whose wife Bunnie XO, 44 ...

"And then I went to jail and got a couple ... tattoos in prison, but Jelly Roll said that he's well aware. "Oh yeah, listen, I've gotten staph infections from bad tattoos.

Jelly Roll is sharing his biggest ... also admitted to getting tattoos that were unhygienic. Sarah Kerver/Getty "I've gotten staph infections from bad tattoos. I've learned nothing," he said.

On a recent episode of SiriusXM's 'The Howard Stern Show,' the country singer admitted that some of his tattoos "suck bad" Jelly Roll is sharing ... "I've gotten staph infections from bad tattoos.