Is your substrate wet and soggy, or dry? I had one snake that shed, and one of the "new" scales came off with the shed and it left a white spot. You could see the scale attached to the shed skin; it was a head scale like yours. In a few sheds, the snake looked normal again.
A pink tinge to the belly probably just means that a shed is coming. But if you have an overmoist substrate, that might mean scale rot.