The nits may look like dandruff, but they are specks rather than flakes. They won't move when you try to brush them away—they are stuck onto the hair. Itching from lice can worsen at night.

Because head lice can move fast, it may be easier to spot the nits. Nits can look like dandruff. You can identify them by picking up a strand of hair close to the scalp and pulling your fingernail ...