I (In Photoshop) Converted to grayscale and inverted the image ...is there some particular reason you inverted the image? For a bump map, darker areas = lower/sunk in and lighter areas = higher/raised up. If you look at the back side of your fingers (knuckles), you'll see that the darker parts of the folds are the sunk-in parts and the tops of the folds are lighter. Same thing with skin-poses. If you 'invert' your texture, you are getting the opposite affect of what you're looking for. Note that there ARE a few types of skin that are typically darker and may also be raised (nipples, moles, viens etc), but those should be treated separately (invert only those areas, but even then, keep in mind that any wrinkles/folds on a nipple, for example, would still follow the initial lighter=raised, darker-sunk, so it's best just to brighten that entire area instead of inverting it). Anyway, this probably has nothing to do with helping the little black spots you're seeing (stewer or someone can probably tell you how to fix those), but I keep running into this 'invert texture to create bumpmap' myth thing and try to help correct that when I can ;).

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