Maculomancy: divination from the shape & placement of birthmarks. 

The placement of your birthmark tells the story of how you died in your past life.
Oh, really? Mine is on my neck.
You must have been hanged. Maybe you were a witch.
Or maybe I killed myself, like for love or something.   
Witches & lovers are the same thing. They both manipulate what you believe in & call it magic.