Basically, you just stick your head under the clothe and into the box. Inside there is a mirror for you to see your own reflection under ultra violet light and a hole opposite so the expert can take a look as well and explain what everything means. If you have near perfect skin, I am assuming that you would look like this lady below.
But in reality it is not such a pretty experience. We are no expert, but from our combined experience, we do know that patches of purple means dry skin and white means dead skin (not make-up, this machine goes beyond the surface of the skin, so one doesn't need to remove make-up to have a face scan-super convenient!).
Anyways, even though it wasn't a very pleasent experience (reality often isn't), we highly recommend a face scan, because it really reveals all the problem areas of the skin one has neglected or was unaware of. Better late then never right?