I had this same thing happen as well. Based off of your mod list and what TheGadget1945 said, it seemed that the common enemy was the 2pacskimpy mod. i made a save when the faces were still brown, closed out of the game, uninstalled the mod, loaded back in at that save and so far the brown face have been gone. Hopefully it will stay that way.
Player character (and other NPC's) faces turn brown after a while.
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I had this same thing happen as well. Based off of your mod list and what TheGadget1945 said, it seemed that the common enemy was the 2pacskimpy mod. i made a save when the faces were still brown, closed out of the game, uninstalled the mod, loaded back in at that save and so far the brown face have been gone. Hopefully it will stay that way.