Laser hair removal focuses light into hair follicles
https://www.google.com/maps/d/u/0/embed?mid=16bs8OcyQGwTrzTxseMH2ucrU9UyGvKU&ehbc=2E312F&noprof=1
Laser hair removal focuses light into hair follicles, converting it to heat that disables growth while leaving surrounding skin largely unaffected.