Steven was thrilled by the medical treatment he received, which meant he could return to the stage last night.
He said: "It was like one-stop shopping. They stitched up my eye. They did a little plastic surgery. And they fixed my tooth. All in one fell swoop.
"Short of having my leg taken off, people are going to expect me to take the stage."
After last's night show at the Jockey Club in Asuncion, the American Idol star's bandmates admitted they were thrilled by his performance.
Guitarist Joe Perry tweeted: "Steven even played harp with his busted lip my mind was blown. He put on one of his best shows ever. Aerosmith rocks on.'
"Gotta hand it to Steven for playing the show tonight considering how sick was from food poisoning the night before. He's amazing."
- BANG! Showbiz