턱에 갑자기 멍이 든 원인은 무엇일까요?
여자친구가 오늘 아침에 턱 끝에 멍이 들어있었어요. 잠잘 때는 없었고 부딪힌 적도 없는데 무슨 일일까요?
What can be the cause for a sudden bruise on chin with no history of any injury?
My girlfriend woke up with a bruise on the end of her chin this morning. She never had it when she went to bed and never bumped it. What can it be?