in college i dated this girl.
a couple days into it, she touched that spot on my throat where the throat meets the chest, under the Adam's apple, the little hollow there, and said, "birthmark."
i said, "Really, I have a birthmark?"
She said, "It's light - it's not like a mole or anything - the skin is just darker in a patch. A birthmark."
i said, "I never really looked closely."
then I forgot about it.
Over the next couple months, every once in a while she would offhandedly touch that spot and say, "birthmark."
Then one day I remembered to look at it in the mirror. I rubbed it with soap and it washed off. It was just dirt.