Head lice are common. They can usually be cleared with treatment.
Head lice are common in children, but can affect anyone of any age. They are not a sign of dirty hair or poor hygiene. Close hair to hair contact is usually needed to pass lice on. Head lice cannot jump or fly, but walk from one head to another. They soon die when away from hair, and do not live in clothes, bedding, etc. Most head lice infections are caught from family or close friends who are not aware that they have head lice.
Many people with head lice do not have any symptoms. An itchy scalp occurs in some cases. This is due to an allergy to the lice, not due to their biting. It often takes about three months for an itch to develop after you are infested with lice. Therefore, you may not notice that you have head lice for a while, and you may have passed them on to others for some time. Head lice and nits do not wash off with normal shampoo. Head lice do not cause any other medical problems. The number of lice that may be on one person can vary greatly. However, commonly, there are fewer than 15 lice present.
Head lice are difficult to find just by looking in the hair. If you suspect that your child (or you yourself) have head lice, it is best to do detection combing. Some people advise that you do this to children's hair regularly, about once a week.
This will take 5-15 minutes to check each head, depending on hair length and thickness. It is also used as a treatment for head lice - see later.
This will take 3-5 minutes to check each head, depending on hair length and thickness. Although useful to detect head lice, it is not useful as a treatment
Treatment is needed only if you see one or more live lice. Nits (empty eggshells) do not always mean that you are infested with lice. Nits can stick to hair even when lice are gone (for example, after treatment that kills the lice).
Currently, there are five main recommended options for clearing head lice:
The treatment chosen may depend on your personal preference, and what you have tried before (if appropriate). Each treatment has a good chance of clearing head lice if applied or done correctly and if all affected people in the household are treated at the same time. Each treatment is now briefly discussed but for details of how to use each treatment, read the instructions that come with the packaging.
Dimeticone is a silicone-based product. It is classed as a physical insecticide and is not classed as a chemical insecticide. Dimeticone has a good safety record and is widely used in cosmetics and toiletries. You should apply the lotion twice - seven days apart. Each application is left on for at least eight hours (overnight) and then washed off with shampoo and water.
Dimeticone is thought to kill lice by a physical process rather than by any chemical effect. It is thought to work by blocking the tubes used by the lice to breathe and by blocking the way the lice pass out water, which kills them. However, it is not thought to kill unhatched eggs. This is why two applications are needed, seven days apart. The second application makes sure that any lice that hatch from eggs which survived the first application will be killed before they are old enough to lay further eggs.
Dimeticone is suitable for all ages, those with skin conditions, and those with asthma. It is available on prescription. You can also buy dimeticone over-the-counter (although not for children younger than six months old).
Wet combing is a way of removing head lice without having to use a lotion to kill them. Briefly, the method is similar to wet combing (detection combing) described earlier. But, you need to do this several times, four days apart. You will need to do this on every member of the household who has head lice.
It takes up to an hour to do a wet combing session properly. You need the correct toothed detection comb as described earlier. Only one kit is needed for a family as it is washable and reusable.
You need to do the above routine at least four times, every four days. The number of sessions required depends on the last time you see lice.
The downside to this treatment is that it is time-consuming. Fuller details of wet combing (bug busting) treatment can be obtained from:
Community Hygiene Concern (contact details given earlier).
This is classed as a physical insecticide and is not classed as a chemical insecticide. It works in a similar way to dimeticone. You apply the solution to the scalp and leave in place for 10 minutes. The hair is then combed with a fine-toothed comb to remove lice. Then wash using shampoo to remove the solution. Treatment should then be repeated in seven days time. The second application makes sure that any lice that hatch from eggs which survived the first application will be killed before they are old enough to lay further eggs.
This treatment is suitable for those with asthma. It is not suitable for children younger than two years of age or people with skin conditions. It is available on prescription and also to buy over-the-counter
This too is a physical insecticide and works in a similar way to dimeticone. You apply the spray to the hair and scalp and leave in place for 15 minutes. The hair is then combed with a fine-toothed comb to remove lice. Then wash using shampoo to remove the spray. Treatment should then be repeated in seven days time. The second application makes sure that any lice that hatch from eggs which survived the first application will be killed before they are old enough to lay further eggs.
This treatment is not suitable for children younger than two years old, people with skin conditions, or those with asthma. It is available on prescription and also to buy over-the-counter.
Malathion is a chemical insecticide that has been used for many years to treat head lice. The malathion kills the lice. There are various brands.
It is suitable for all ages and those with skin conditions. It is available on prescription. You can also buy malathion over-the-counter (although not for children younger than six months old). You should apply the lotion twice - seven days apart. Each application is left on for at least 12 hours (overnight) and then washed off with shampoo and water. The second application makes sure that any lice that hatch from eggs which survived the first application will be killed before they are old enough to lay further eggs.
(Note: shampoo, mousse and creme rinse preparations of malathion or other insecticides are not recommended as they do not work as well as lotions or liquids.)
Various other insecticides have been used in the past. For example, permethrin is no longer recommended because there are concerns that many lice are now resistant to it. Phenothrin and carbaryl are no longer available in the UK.
There are various other treatments that are said by some people to work. For example, tea tree oil, quassia, other essential oils, herbal remedies, electric combs. However, there is a lack of research studies to confirm that they work well in most cases. Therefore, until more research is done, these other methods cannot be recommended.
Only if they have head lice. All people in the same home, and other close head-to-head contacts of the previous 4-6 weeks should be contacted. Tell them to look for lice and treat if necessary. (It used to be advised to treat all close contacts even if they had no symptoms. This has changed to just treating people who have head lice.) All people with head lice in the same home should be treated at the same time. This stops lice being passed around again.
The wet combing method of treatment discusses above how to check for success. For other methods of treatment (lotions, sprays, etc), check that treatment was successful by detection combing 2-3 days after completing a course of treatment, and again after a further seven days. Treatment has been successful if no lice are found at both sessions.
Children with head lice should carry on going to school. Contrary to popular belief, head lice do not spread quickly through schools. Alarming head lice letters from schools are usually unhelpful. You need close head-to-head contact to pass lice on to others. Young children who play closely together may pass lice on. If your child has head lice, a common-sense approach is to tell the parents of their close friends to look out for lice in their children.
There is no good way of preventing head lice. Lice repellent sprays do not work very well. If you do detection combing of children's hair every week or so, you will detect head lice soon after they have affected the hair. You can then start treatment quickly and reduce the risk of passing them on to others.