Witch mark
The sort of physical mark is an alleged sign of the devil after an alliance ( pact ) alleged witches or warlocks speak like a stamp on the skin pressed.
The witch believers of the early modern period believed they recognized it in particularly conspicuous moles or similar skin irregularities. Since almost everyone has such a point somewhere on their body, one could find such "evidence" in the context of the witch trials with a targeted search in almost all of the accused.
In order to be absolutely sure that the skin irregularity found was a witch's mark, the needle test was usually carried out. Here the idea came into play that witch marks are places insensitive to pain .
Finding a witch's mark plays a role in Nathaniel Hawthorne's classic The Scarlet Letter .