Thanks for the replies guys. Optimise for Outdoor Lighting was already unchecked. In Advanced Material Editor: Effects Tab; I found Luminous set at 0%, however Ambient was set at 40%

I set Ambient down to 0% for both torso skin and hand skin and the result is much better.
(see attached image)
You will notice that the effect is not completely gone; there is still some glow around the thumb and the little finger. I wonder if there is another variable somewhere that adds Ambient or Luminous light?

Thanks again for your help; this is one step further towards solving this problem.