The Cruelest Cut

Vanessa's arms no longer show the damage she once did to them. That's saying something, given that the damage was considerable. The college freshman, 19, started with just a few scratches from a sharp piece of plastic. Later came the razor blades and then the kitchen knives. After a time, she took to wearing bracelets to cover her injuries; when that wasn't enough, she began cutting less conspicuous parts of her body. "I was very creative," she says, with a smile.

Vanessa needn't be so clever anymore. In the past 18 months, she has cut herself only once. She was pleased...