I just noticed an issue where the human haircut with ribbons adds a small line hole behind the ear. You can actually see out the other side of the head through it. I haven't played much lately but don't remember noticing it before. I tried different heads, sliders, but nothing will get rid of it. My friend tried the haircut on his character and saw the same thing.
https://imgur.com/s4JREZI
https://imgur.com/92z3eWm