There is simple system by using two perpendicular polarization films. The angle on which light should fall is called Brusters angle. This is an angle on which incident polarized lights polarization plane is turned on 90 degrees when it is reflected.
The system of imaging looks as follows:
And here you can see a results where photos are made with polarizer system and without it;
1) Without polarizers:
2) With polarizers:
As you can see, polarizers remove surface reflections and it is better view of inner skin structure. This is necessary procedure when images are processed digitally.