I had ipl on my whole body, except my face. Hands, legs, arms, shoulders and back. All my treatments were done at my dermatologist's office, by a trained nurse. She was zipping through my back at the end of one of my sessions and burned me in two nickle-sized spots. I had blistering at first and then hyperpigmentation. It took a year for the hyperpigmentation to fade completely. Even with that mishap, I am absolutely thrilled with my results. Of course, I was able to easily hid the hyperpigmentation on my back. Had it been on my face, it would have been a totally different story.