He's not very convincing, but he is reaching for the jar and saying it's fine so he must mean it. Either way she nods and shifts around so her back is to him, reaches for the hem of her shirt and starts to pull it up.

The first few inches go alright, but it becomes difficult once the fabric starts to stretch over the bruise and put more pressure on it. She's stiff still and even with the shirt barely halfway up her back it's impossible to miss the injury. She's black and blue, struggling a little to get her shirt off and holding her breath to avoid hissing in pain.