If your scalp is itchy, dry, and flaky, it could be because you aren't rinsing all of the shampoo out. Or it could be because you have something called dandruff. If you have dandruff, when you scratch your head, the skin flakes off and lands on your clothes. It's really noticeable if you're wearing dark colors. You can use a special shampoo that your parents can buy at the store. There are many to choose from. Talk to your doctor or a skin doctor (dermatologist) to help you decide on the best shampoo for you.