"It's--" Yuya starts to shift his sleeve up, but as a long button up it doesn't go far enough and just ends up brushing the wound harder, making him flinch.

Yuya pauses before trying again, rolling it up until he gets it over his elbow. He bites his tongue as he turns to show Nana, unable to actually see it himself.

It's barely peeking under his sleeve, but part of the skin to his elbow looks ashen and... grey?

It isn't the normal sign of a bruise, burn wound, even tear.