bruno's probably right
SSS causes crap like that, but also sometimes it just occurs regardless, damned annoying, and may indeed be due to radiosity not working right, try welding up the model?

and do NOT use Poser shaders (materials). always import with that turned off if you want best effect, IMHO , and carefully go through every material to see how screwed up they are and fix 'em.
MDT maybe right, usually it's highlights but I've seen some weird settings on importing Poser items! :p

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