the bacteria thrive on the oily skin, the oily skin is some acne sufferers
a lack of vitamin D... probably trying to
make the precursor to
vitamin D in
the skin so it can be turned to vitamin D in the liver.
But what happens when you have
sufficient levels of vitamin D??? Well, your body no longer needs to make
the precursor in the skin.
It also makes sense... think about it... acne is always on the face, neck, back, shoulders, or chest.