I have this problem. I became a vampire and my skin was then pale, so I went into showracemenu to make my character more tanned like they had been before I turned into a vampire, but the head remained pale. =/ Just the other day I was a vampire with my normal skin tone and it was fine. I had to cure it in order to buy a crossbow from the dawnguard, but when I went back to becoming a vampire I somehow ran into this problem.