My daughter is 10 yrs old, she has long thick curly hair. She has recently been scratching her scalp and neck, so much that it is starting to break the skin. I looked for lice...none. Also, no dandruff. She does only comb her hair after washing it (every 3 days in winter). I'm wondering if its a buildup of dead skin. I'm looking for either home remedies or a anti itch shampoo that works. Any ideas?