They may be signs of vitiligo with just one little spot behind the head, right now I don't think its anything to worry about. I may see another small spot on your scrotum, that too, should be anything to worry about either. Much larger areas that have lost their pigment would be vitiligo. Are there any other area of your body that have lost pigment?
At 62, I'm just the opposite with a rather dark shaft skin and a dark scrotum. I'm trying to bleach my penis to a more pink color.