The inside of the mouth and the teeth are lit, and that is impossible from your lights positions.

So as BB said, you have a skin shader problem.
probably some ambient crept in.

Go through your shader setup and remove all ambient there.

With the lights you are showing the mouth inside should be BLACK.

i think your eyes are the only ones having the right shader setup,
it is the rest of the face that has a problem, including the teeth and inner mouth..

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