The first step is to treat the child's head with lice shampoo. You can get lice shampoo at your local drugstore. Follow the instructions on the bottle. After shampooing, comb the child's hair with a nit comb. When her hair is dry, go to a well lit area to remove the nits, or eggs.
Sunlight is best, but use bright lamps indoors if it is dark outside.
Nits are tiny and very hard to see, especially if you don't know what you are looking for. They can be clear, whitish or brown in color. They are oval-shaped and glued tightly to the hair shaft, usually near the scalp. If you can, ask the person who discovered the lice to show you what the nits look like. You cannot shake or brush nits off.