Can pubic fleas go into hair on your head?

Yes, it's possible: Public lice (crabs) have their favorite spots, and their less-favorite places. They prefer pubic hair, armpit hair, beards, moustaches, and eyebrows... over scalp hair. However, they can grab onto scalp and be found there. If the eggs are very white, and "bugs" are on the scalp, those are likely head lice. The treatment is the same type of medication (such as Nix).