Megan Abbott said this quote

Skye said when she looked at Lise, she saw a black mark, an aura. Just like the mark on Lise’s thigh, it was a warming. Deenie thought of it now, of Lise and the stretch mark on her thigh. And how the fevered mind of her fevered friend might believe anything. But also, somewhere inside, it felt the smallest bit true. That the stretch mark was a kind of witch’s mark, the blot of Lise’s body that reminded you of what she had been -a plump, awkward girl- before the lithesome beauty took her place. It was a kind of witchcraft, that transformation.