Before I tried my first IPL machine, I was suspicious. A handheld device that flashes at your skin and it somehow zaps away your body hair? It all sounded rather unlikely. Except then I got one, and it did just that, and it's been my summertime savior for the past five years. I paraphrased before, so let me back up a bit. IPL stands for Intense Pulsed Light: multiple wavelengths of light that look a little like a photo flash. (They're different …