Do you have any other signs of bugs aside from an itchy head- like a rash of some type? It's possible that it could be a bed but still, when they are in the first lave stage they are very small and white. If you can, and you see another, I'd try to trap it in a bag and take it into a doctor, this way you know for sure what it is, and how to treat anything you are seeing as far as the itching.