I don't know for sure. I do know that the body will expel toxins through the skin when the other modes of elimination are backed up.
It was disgusting. When I first dropped carbs and starch it was oozing out the back of my head.
The Vitamin K supplement caused the same thing to a smaller degree, but I'm not sure if the K supplement was causing a regrowth of more yeast and then since I'm on a zero carb diet not all of it could survive and so it died and was expelled through my skin again.