Oops. She's unknowingly hit a nerve with her innocent question, by the looks of that embarrassed flush. Peter's right, though, she does have a particular Look that's extremely useful-- it even works on Tony, 95% of the time. The kind of steady, patiently expectant stare that perfectly conveys just how disappointed (and/or upset, depending on the target) she'll be if denied answers. She doesn't quite even employ it here, at least on purpose, before Peter spills the beans.

It's... not what she'd expected. Honestly, she'd thought it was something more mortifying based on his reaction.

"Oh." She winces sympathetically. "Well, you're lucky you got away with just a bruise. You could have easily broken something slipping in the shower. Does it hurt? Maybe we could find some ice..."

She's mostly thinking out loud, now. Look, he's a kid and he's been banged up, it soothes Pepper's current anxiety by a lot to focus on someone else's well-being instead!