Cuts and scars.
Wrists: deep brown horizontal gouges, intersected by shallow vertical scratches. She made those with blades pried prison-style from a plastic disposable razor.
Thighs: shallow but multiple, in parallel lines like the tracks of a racecourse. She made those the same way, with blades taken from a smashed plastic razor, the way the girls taught her in jail.
Face: vertical below the right eye, alongside the nose, over the cheekbone. She made that with a serrated kitchen knife. While she was bleeding she looked like the cover of Aladdin Sane.
Fear.
That one day you'll come home to find her dead in the bathtub.
Or that she'll kill you in your sleep.