Just had a look at posette, you're talking about the dark grey smudges in the crotch where the hip meets the thighs? Those artifacts look about the same as I encountered. It seems to be a problem in rather low poly meshes, or at least that's my suspicion, as the mesh I'm working on is rather low poly too. It's something to do with how the UV is cut in relation to how the polygons are flowing in an area, in particular where a flow merges, not necessarily a pole but an area where say a tri or a triangular shaped quad merges and the proximity of the cut to that area. This is just my guesstimates but I was able to fix the problem as I said in my previous post. Not a biggie on your own mesh, early in the creation process. Probably a big issue with somebody elses mesh that requires content compatibility. Not sure how you would fix in a case like that.

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W10 Pro, HP Envy X360 Laptop, Intel Core i7-10510U, NVIDIA GeForce MX250, Intel UHD, 16 GB DDR4-2400 SDRAM, 1 TB PCIe NVMe M.2 SSD

Mudbox 2022, Adobe PS CC, Poser Pro 11.3, Blender 2.9, Wings3D 2.2.5

My Freestuff and Gallery at ShareCG