Laser skin treatments date all the way back to the 1900’s with Einstein and photons and the interaction they had between molecules that were energized that had an interesting outcome. But it wasn’t until 1960 that the first laser was created for clinical use, resulting in the selective photodestruction of pigmented skin matter. This means they were able to target things like black hair follicle! And voila the birth of laser hair removal and other laser skin treatments began. Check this site for more info: https://www.dermatologytimes.com/view/history-aesthetic-lasers