Hmmm.

Hesisant to toss this in the mix as I am shader challenged (despite Bagginsbills best efforts Though I was able to follow face-offs tutorial at his site).

Anyhows....

I saw in a tutorial sometime ago a texture trick where the Render Clouds filter in Photoshop was used to give some variance to skin tone for a model. (I may have even posted about that here!)

Toss something like that in the skin shader and think that may work?

"Few are agreeable in conversation, because each thinks more of what he intends to say than that of what others are saying, and listens no more when he himself has a chance to speak." - Francois de la Rochefoucauld

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Poser 12: Inches (Poser(PC) user since 1 and the floppies/manual to prove it!)