hi, i have a 11 year old son that has 2 small red, raw spots on the top of his head/scalp. The rest of his scalp looks perfect. He has a crew cut so it is very easy to see. It itches him a lot. I know head lice is sometimes in school, but i have looked very good and see nothing of that nature. I only see some light, flaky dandruff in some parts. Pls help. thx.