MTV News reported the incident, which lasted just a few seconds, happened Wednesday night while the rockers performed "Bullet With Butterfly Wings."
"Thanks a million to the fans in Tampa last night for a tremendous show! We can't tell you how much we appreciate you today," Corgan said Thursday via Twitter. "And for those that saw me fall last night during 'Bullet,' that wasn't a stage move or clumsiness -- that was me blacking out and wiping out. I have no memory of falling against the drum riser and my guitar cabinet. But I can tell you I've got quite a good bruise and am moving slow."
MTV News said Corgan didn't appear to suffer any other injuries during the collapse and reported he was back to work Thursday.
Kim Kardashian, Kanye West reportedly set wedding date
Ray Liotta sues skin care company over use of likeness