Reds manager Terry Francona said Tuesday that Petty was dealing with a blister during his start for Triple-A Louisville on Sunday, Charlie Goldsmith of Fox 19 Now Cincinnati reports.
Petty bit the blister off his finger and continued pitching, but he allowed three runs on six hits with a 1:3 K:BB over 3.2 innings. It's unclear when Petty will make his next start, but the blister issue takes him out of consideration for a start with the Reds later this week.