[Seeing Sans wash his hands, properly, while that pile of dirty laundry lies on the floor to the side... it's almost enough for Papyrus to feel self-conscious. But he's already self-conscious, uncomfortable with anyone seeing his torso and the situation of his face. Not to mention the sensation in his eyes lingering from having cried a while, the general aches and yearning for privacy after days in a room with others...

He does notice some hints of things awry, what with that expressionless face, but it's hard for him to read how much of Sans's tension is Sans, and how much is Papyrus projecting his own tension onto his brother's seriousness. It's not as if Sans is never serious, or has never taken things seriously - Papyrus wouldn't be so outraged by the persistent lazy habits if he didn't know from experience that his brother could behave differently. If it takes a kinda-crisis like this... he'll take it, and not tempt his brother's whims by drawing attention to it with more than a raised eyebrow.

...Not that his raised eyebrow is visible, he realizes after Sans's question, and he gives a subdued nod.] I'll let you know... if I notice any. [Any extra, that is to say. But that doesn't have enough bravado to it, and is almost dismal enough for the unspoken words to be spoken, so he doubles down to add:] B-Besides! I think the stitches... are holding a lot in. So the bandage threads, just need to catch a little more.