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That looks like the compression Bodyshop automatically applies when it exports the textures to your final project. It tends to happen with dark colours like yours. If that's the case, the best way to fix it is with SimPE. Here's how:
1. Make sure you have a good, unpixelated version of your texture
2. Open your final product's .package file in
SimPE - you want the file from SavedSims, not from Projects
3. Export the texture .png to your desktop or wherever you can easily find it
4. Open the exported texture .png in your graphics program
5. Paste your good, unpixelated texture into a new layer on top of the pixelated one
6. On your good layer, erase (or mask out) the parts of the texture that are transparent on the exported PNG. You should be left with your good clear texture and the right spots invisible for the sim's skin to show through.
7. Save your new texture as a PNG file.
8. Import your new PNG into the .package file using Build DXT - make sure the quality level is at least DXT3 (5 is fine too). DXT1 will not keep the transparency and will be pixelated.
9. Compress your file with the Compressorizor. This is optional but I highly recommend it because files with textures imported this way are ridiculously large. Compressing reduces them back down to normal levels.
I know that sounds like a lot of steps, but once you get the hang of it it's not too bad.