So I'm still thinking about this.
Izzy, who runs a sword through Stede's side. That doesn't notice the flower that appears on his left side for a few days. In fact, it's not till after Blackbeard cuts off his toe that he sees it, just below the band of his smalls.
A little blue flower with a +
So one of the options is this one :Wherever your soulmate is wounded, you get a flower tattoo that fades if the injury fades and stays if their injury scars
Imagine Stede with all these flower tattoos on his back that he doesn't understand - till Stede sees the whip scars on Izzy's back.
