On my homepage, trekkiegrrrl.dk I have a "rotting skin shader" that mught be of use. It's for... Poser 5 James I think, but it's easily used on other figures if needed, just manually change the texture references to whatever figure you're using. 

here, I've conformed the person... hmm probably the Poser 3 nude male as he's the one that fit the old Poser skeleton... anyway, conform a suitable person to the skeleton, put the rotting shader on the skin and... rotten... :)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.