Dealing With A Spot Of Bother

(I work in a small store, and I find that customers talk to the staff more than anywhere I’ve worked. I currently have a fairly large spot in the middle of my forehead, which I am too lazy to cover with makeup but no one has commented on all night. An hour before we close, this happens:)

Customer: “You look like you’ve been shot in the head!”

Me: “Mhm…”

Customer: “I’d know; I used to be a police officer.”

Me: *nods, clearly uncomfortable as he’s speaking quite loudly in a small store*

Customer: “Well, you ladies have a nice night now! Look after that bullet wound!” *laughs and leaves*

Coworker: *to me* “…I hope he gets shot in the head.”