Obviously its not commonly known, or used judging by the replies , but while mooching around on the web I did come across this video, hope it answers some questions
So it appears that facial acupuncture works by bringing blood to the surface of the skin bringing nutrients and oxygen, thus helping to tone the skin and make you look more youthful.
Wouldn't just rubbing your face achieve the same thing without the pain?
I believe Angelina Jolie has facial acupuncture in the form of a needle roller. This is a roller full of minute needles that get rolled onto the face bringing blood to the surface of the skin, encouraging cell repair and improved circulation.