“Hey, um,” they tapped his shoulder after he had finished taking his selfie. Then they gestured to their own forehead, frowning.
“Who did that to you? Did you do it? Or did someone else?”

“Er…” He flinched when they tapped his shoulder.
“Er…no, I woke up with it on…tried washing it but it wouldn’t come off…”
It was clear that he was embarrassed by it, with his voice lowering down to barely a whisper.
“It’s…it’s nothing to worry about.”