I think facial skin has a temper.
Otherwise what explains its, sometimes, violent reaction to new products. Coming with pimples blazing and unrepentant patches of dry skin scattered recklessly on the once, seemingly, obedient face.
And I think some parts of the body, like the stomach, very ably take advantage of this temper tantrum tendencies.
Eat anything the stomach believes unacceptable. If it does seek to leave immediately, using the opposite route, it fights through the face; sweat, itches and all the ugliness it fancies.
Or maybe the facial skin has ADD. Maybe it needs psychiatric attention!