Saturation algorithms in RAW processors
One potential issue with some (but not all) RAW processors is that they may apply a saturation algorithm that is prone to making flesh tones appear green.
In the comparison above, the image (the back of my hand) was processed via Adobe Camera RAW and Colormancer (my saturation algorithm). What is happening is that the saturation algorithm is being applied on the RGB values without gamma correction. This is the cause of the green shift.
In the video world, the RAW processor for the Red 4K digital cinema camera also exhibits a similar effect.
However, keep in mind that RAW processors won’t necessarily all use the exact same saturation algorithm so this effect may not appear everywhere. It is something to watch out for in your RAW processor of choice.