Slideshow: Treating and Preventing a Head Lice Infestation

Spotting a tiny, white speck in your child's hair is enough to make many parents panic. Sure, head lice score high on the yuck factor, but they usually don't cause serious disease. Here you'll find all the information you need to get a lice infestation under control.

Head lice are tiny six-legged insects that cling to the scalp and neck and feed on human blood. Each louse is about the size of a sesame seed and can be hard to spot. Lice eggs, called nits, are glued onto hairs near the scalp and can be even harder to see.

Head lice are most common in young children who go to day care, preschool, or elementary school. Children of this age often play together closely and with more hair-to-hair contact, and they may share brushes, hats, hair clips, and the like. Adults who live with children also have a higher risk of getting head lice.

Lice usually spread through direct head-to-head contact that allows the pests to crawl from one person's hair into another's. Lice can also survive for a short period on clothing or other personal items, so a shared hairbrush can help a louse find a new host. Lice cannot jump or fly from one person to another.

Although lice and their nits are small, they are visible to the naked eye. Head lice can be white, brown, or dark gray. They are most often found in the hair at the back of the neck or behind the ears. The nits are round or oval specks that are tightly glued to hairs near the scalp. If you try to slide the nits off, they won't budge. Research suggests combing through wet hair is an ideal way to spot an infestation.

Spotting a live louse or nymph (a young louse) is often the only sign of an infestation. Seeing nits alone doesn't confirm an infestation. In many children, head lice don't cause any discomfort. When symptoms do happen, the most common problem is itching that may start weeks or even months after the lice move in.

The itching from lice is caused by an allergic reaction to the bug bites. A lot of scratching may lead to sores or raw skin on the scalp. It's not common, but sores from scratching can become infected. Call a doctor quickly if the skin becomes red, swollen, or painful or the lymph nodes in the neck become tender. These may be signs of a skin infection.

Head lice will not go away on their own. If you suspect your child has an infestation, there are several steps you should take right away. Call your doctor to confirm the diagnosis. Notify your child's day care or school so other students can be checked. Examine all other members of the household for signs of lice. Finally, treat everyone who's infected at the same time.

You can find lice-killing treatments over the counter. They are often made from extracts of chrysanthemums or a synthetic version that is similar. They are considered safe, but they may not be recommended for young children. Sometimes lice are resistant to these. Speak to your doctor about whether the lice in your area are resistant to these drugs. No matter what you treat with, follow instructions on the label carefully for how long the medication should be left on the hair and how it should be washed off. A second treatment may be needed 9 to 10 days later.

Although lice don't survive long when not on a human, it's best to wash the bedding of anyone being treated for lice. Clothing worn in the past 48 hours should also be washed in hot water. While parents are sometimes told to clean and quarantine all of a child's stuffed animals, experts say this is not necessary. If your child sleeps with a favorite plush toy, put it in a hot dryer for 30 minutes. That should kill any creepy-crawlies.

Some parents claim mayonnaise, white vinegar, or tea tree oil are effective natural remedies for head lice. Mayonnaise is said to smother lice, but check with your doctor first. Vinegar is rumored to dissolve the glue that keeps nits stuck to the hair. There is no scientific evidence to support these home remedies, and pediatricians say you should not rely on them as your main treatment.

Fine-toothed combs are another way to get rid of lice. This comb has teeth fine enough to pull out lice and their nits. It worked for the ancient Egyptians -- nit combs have been found in their tombs. The drawback is that it takes time and patience to comb every last nit out of a child's hair. It is more effective to comb the hair after treating with a medicated shampoo to get rid of any stragglers.

Head lice are not a scourge of the lower classes, nor a sign of poor hygiene. They affect children across all levels of income, social class, and cleanliness. The bugs can survive underwater for up to 6 hours, so kids who bathe regularly are just as vulnerable. The good news is lice don't carry diseases.

According to the American Academy of Pediatrics, a healthy child should not be kept home from school because of lice. It recommends that a child remain in class but avoid head contact with others. After treatment, dead eggs may remain in a child's hair until they are removed. Some schools have a "no nits" policy, meaning the eggs must be removed before the child returns to class. The American Academy of Pediatrics discourages this policy.

If you have young children, there's unfortunately very little you can do to ward off head lice. Kids will be kids, and when they put their heads together or share hair bows, lice get a ticket to ride. Your best defense is to examine your child's hair and scalp regularly so you can catch an infestation early. Quick treatment will help prevent the bugs from spreading to the rest of the family.