Ugh, it's absolutely awful. The skin condition / holes / maggot videos are the worst. I didn't even watch one by accident, but I do sometimes watch ASMR videos and I think that's the keyword roping these in. It was bad enough to push me into actually flagging them, but of course that does nothing to stop the recommendations so they keep popping up in my feed.
EDIT: Here's an example, but if my recommendations are jammed up with this shit after watching 0 of them I can only imagine what happens if you watch one intentionally.