Well, as far as I can tell, I've solved the problem. I was afraid of trying to sculpt out the problem, since frankly the problem is invisible until render, so I expected to be flying blind in my 3D app. As it turned out, however, I went over the area just under the jawline a few times with the jelly smooth tool, and in all my renders so far since I'm not seeing the marks.

Whew.

It is a bit worrisome, because I realize that when I do full body sculpts, I may end up with similar issues elsewhere, and only a ton of rendering may uncover it. I guess I'll need to recruit some character testers... but I need to finish up with the textures first.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3