Scabies is an intensely itchy rash caused by a tiny mite that burrows into the top layer of skin. It spreads through prolonged skin-to-skin contact, it has nothing to do with cleanliness, and it clears with prescription treatment when everyone in the household is treated at the same time. Head lice are small insects that live on the scalp and glue their eggs to the hair. They spread through head-to-head contact, they do not carry disease, and they have nothing to do with how clean anyone is. Treatment clears them, but it almost always has to be repeated.
The same eight facts on every condition comparison.
It is caused by a mite.
The human scabies mite lives in superficial skin and triggers an immune reaction.
Symptoms can be delayed.
A first infestation can go unnoticed for weeks while it can still spread.
It is not about hygiene.
Scabies can occur in any household or care setting.
Crusted scabies is different.
It carries a very large mite burden and needs a specialist regimen.
Lice live on the scalp.
They feed on the scalp and attach eggs to hair shafts.
Itching can come late.
It is a reaction to bites and may not start straight away.
Inspection comes first.
A fine-toothed comb in good light confirms lice before treatment.
Empty cases are not failure.
Hatched egg cases stay attached as hair grows.
Classic scabies Itchy bumps and burrows with few mites.
Burrows between fingers A thin, winding track is visible in the finger web.
Crusted scabies Thick gray crusts with huge numbers of mites.
Nodular scabies Firm itchy lumps that can last for months.
Adult lice Tan to gray insects about 2–3 mm long.
Nits on the hair Oval eggs glued close to the scalp.
Scratch marks Red bumps behind the ears and on the neck.
Scabies mites burrow into the outermost skin and lay eggs there. The immune reaction to mites and their products causes an itchy rash; the itch does not mean the mites are burrowing deep into the body.
Head lice live among scalp hairs, feed on blood and attach their eggs to hair shafts. The body's reaction to their saliva causes itching, which may take time to develop after a first infestation.
Scabies. Can affect people of any age after close contact with an affected person.
Head Lice. Most common in school-age children; close contacts of any age can be affected.
Scabies is caused by a tiny mite that burrows into the top layer of skin. The intense itch is the body's allergic reaction to the mites and their eggs.
Head lice are tiny insects that live only on the human scalp. They can't jump or fly, so they spread by crawling from one head to another.
Evidence labels come from each condition’s own treatment list.
Worth trying in the daytime, though scabies itch is only partly driven by histamine, so the effect is usually modest. They will not shorten the infestation or replace treatment. If the itch is stopping you sleeping, a sedating antihistamine at night is the more useful version of this.
Mild steroid cream helps the itch, but only after scabies has been diagnosed and treated. Used before that on an undiagnosed itchy rash it flattens the rash enough to make scabies much harder to recognize while the mites carry on spreading — sometimes called scabies incognito. If you have been using it, say so at your appointment.
A cool oatmeal soak settles the itch for a while during the weeks it takes the allergic reaction to fade. Keep the water cool rather than hot, because heat and hot showers reliably make scabies itch worse. It is comfort only, and it does nothing to the mites.
The home remedy asked about most often. It does kill mites in a dish, and small studies have looked at it, but there is no evidence it clears an infestation on a person. Applied neat to skin that is already scratched and inflamed it commonly stings and can cause a reaction of its own. Bleach and vinegar do not work either.
Sold in several natural lice products and not shown to clear an infestation reliably. It irritates the scalp of a child who is already scratching, and it is a common cause of allergic reactions. If the older products have stopped working, a prescription treatment is a better answer than an essential oil.
The other older over-the-counter option, from chrysanthemum extract, used the same way with a repeat in seven to ten days. It kills fewer eggs than permethrin does and lice are commonly resistant to it. It is avoided in anyone with a ragweed or chrysanthemum allergy.
A silicone lotion that coats and suffocates the lice rather than poisoning them, so resistance is not an issue with it. It is left on for the stated time — often several hours or overnight — and repeated a week later. It is a good option for a child who has already failed permethrin, and it is gentle on the scalp.
The usual first treatment, applied to dry hair, left the stated time and rinsed, then repeated in seven to ten days because it does not reliably kill eggs. Where lice are not resistant it works well. Resistance to it is now common in many areas, so if two proper courses fail, the answer is a different medicine, not a third round.
Permethrin 5% cream. The usual first treatment. It goes on the whole body from the neck down — every fold, between the fingers and toes, under the nails, around the navel and the genitals — and is left on for 8 to 14 hours, usually overnight. Put it back on your hands after any hand washing. It is repeated a week later to catch eggs that hatch after the first dose, and everyone in the household is treated on the same day whether they itch or not.
An older treatment, used where permethrin is unavailable or has not worked. It is applied the same way, over the whole body, and usually repeated. It stings on broken or scratched skin and can irritate, which is why it is rarely the first choice where permethrin can be had.
Precipitated sulfur in petrolatum, applied for three nights in a row. It is the option most often chosen for very young babies and is one your doctor may consider if you are pregnant or breastfeeding — ask them, since that decision is theirs to make with you. It smells strongly, stains clothing and bedding, and is greasy, which is the main reason people struggle to finish the course.
A steroid cream used after the mites have been killed, to settle the itch and the firm lumps left behind. It does nothing to the mites, and used on an undiagnosed itchy rash it blurs the picture while the infestation carries on spreading. So it is a second step, never a first one.
Marketed as both a scabies treatment and an anti-itch cream. It clears the mites in fewer people than permethrin does, so it is not a good first choice on its own. It is sometimes used for the itch after treatment, where it is mild and safe but not particularly effective.
An antibiotic ointment for scratched areas that have become infected — golden-yellow crust, oozing, soreness rather than itch. It has no effect on the mites at all. If the infection covers more than a small patch, or the skin around it is spreading red and swollen, antibiotic tablets are needed instead.
Ivermectin lotion 0.5%. A single ten-minute application to dry hair, and usually no repeat is needed, because it kills the young lice as they hatch. That makes it a good choice for families who have already skipped or fumbled a second application. It is one of the main options when permethrin has failed.
Spinosad suspension. A ten-minute application to dry hair that kills both lice and most eggs, so a second treatment is often unnecessary. High cure rates in studies against permethrin-resistant lice. Cost and availability are the usual limits rather than how well it works.
Malathion lotion. An older prescription lotion that kills lice and many eggs, applied to dry hair and left on for the stated time. It works where permethrin has failed. It smells strongly, it is flammable while wet so no hairdryers, flames or cigarettes near it, and it is not used in young children.
Benzyl alcohol lotion. It works by blocking the breathing holes of the lice rather than poisoning them, so resistance is not expected. It does not kill eggs, so the repeat in seven days is essential. It can sting and irritate the scalp, which matters if the skin is already scratched.
Oral ivermectin. Tablets taken as two doses about a week apart, weighted by body weight. They are the practical answer when a whole household or a care home has to be treated at once, when cream cannot be applied properly, or when cream has already failed. For crusted scabies they are given together with cream, often repeatedly. Ask the prescribing doctor whether they suit you, since they are not used in very small children and are avoided in pregnancy.
A short course of antibiotic tablets when scratched skin has become properly infected — spreading redness, swelling, pain or fever. They treat the bacteria only, so the scabies treatment still has to be done alongside them. This is a common reason a scabies visit ends with two prescriptions rather than one.
An older antihistamine taken at bedtime, for the weeks when the itch is keeping you awake. Most of the benefit is that it makes you drowsy rather than that it blocks the itch, which in scabies is only partly driven by histamine. It is useful, it is short-term, and it can leave you groggy the next morning.
Ivermectin tablets. A tablet taken as two doses about a week apart, used when repeated topical treatments have failed or when applying a lotion to the whole scalp is not practical. It is effective in that situation. It is not used in small children or in pregnancy, so the prescriber checks weight and circumstances first.
Itching can continue for several weeks after successful treatment, so itch alone does not prove that mites remain. New burrows or continuing new spots need reassessment; treating close contacts together helps prevent reinfestation.
Left alone, head lice do not clear. They cause no lasting damage; the problems come from scratching, and occasionally infection on top.
Skin infection from scratching
Scratching breaks the skin and lets bacteria in, so scabies commonly turns into impetigo or, less often, cellulitis. The signs are pain rather than itch, golden-yellow crust, oozing, or spreading redness and swelling with fever. It needs antibiotics alongside the scabies treatment. In parts of the world where scabies is very common, these skin infections are also a route to kidney and heart problems later, which is one reason outbreaks are taken seriously.
Lumps that linger after treatment
Firm, itchy, red-brown lumps can stay on the genitals, groin and armpits for weeks to months after the mites are dead. They are a stubborn allergic reaction, not live infestation, and re-treating with scabies cream does nothing for them. A steroid cream from your doctor, and sometimes an injection into the lumps, is what settles them.
Weeks of broken sleep
The itch is at its worst at night, and by the time most people are diagnosed they have had several weeks of it. Broken sleep is the part that wears people down, and it usually carries on for another two to four weeks after treatment while the allergic reaction settles. It is worth treating in its own right — a sedating antihistamine at night, a cool bedroom and moisturizer before bed all help.
Infected scalp and neck
Scratching breaks the skin, and bacteria can get in on top. The signs are redness and swelling that spreads, weeping or honey-colored crusts at the nape and behind the ears, and tender glands in the neck. It is the main reason a case of lice ever needs antibiotics, and it needs to be seen. Treating the lice properly and settling the itch early is what prevents it.
Weeks of broken sleep and worry
The lasting harm from head lice is rarely medical. It is the itching that keeps a child awake, weeks of repeat treatments and combing, missed school where old exclusion policies are still used, and the embarrassment that makes families treat it in secret. Telling the school and the other families is the single most effective thing for ending the cycle, and it is the step people most want to skip.
Arrange treatment for suspected scabies and close contacts. Crusted widespread rash or infection needs prompt assessment.
Ask a pharmacist or clinician if you cannot confirm live lice, treatment fails, or scratching causes sores or infection.
Because the itch is an allergic reaction to the mites, not the mites themselves, and it takes two to four weeks to settle after they are gone. Moisturizer, antihistamines at night, and a steroid cream if your doctor prescribes one. Re-treating now irritates the skin. An itch worsening after four weeks does need review.
Cleanliness has nothing to do with it. The mite spreads through prolonged skin-to-skin contact - sharing a bed, holding a child, caring for a relative, sexual contact - and cannot be washed off once burrowed. Outbreaks happen in immaculate homes and hospitals.
Yes, on the same day, itch or not. Contacts can carry mites for four to six weeks before itching, so treating only the person with the rash almost guarantees it comes back. This is the most common reason scabies drags on.
You were contagious before you had symptoms, which is why it spreads so quietly. After a correctly applied treatment, most people are no longer contagious after about 24 hours. Many workplaces and schools use that as the point of return; follow local advice.
Not for ordinary scabies. Wash bedding, towels and clothing from the last three days on a hot wash and dry them hot, or bag them for about three days. The mite does not survive long off skin. Crusted scabies needs much more thorough cleaning.
Not the human form. Animals have their own mite varieties, which can cause a brief itchy rash on people but cannot reproduce on human skin and clear once the animal is treated by a vet.
Almost certainly direct head-to-head contact with another child — playing on the floor, a sleepover, photographs head to head. Not the house, the pets or anyone's hair. By the time you find them the contact was weeks ago.
Major pediatric and public health bodies advise against sending children home for lice. By the time they are found they have usually been there for weeks, and lice do not spread easily in a classroom. Tell the school, start treatment, and in most places the child stays. Check your school's policy — some are stricter than the guidance.
No. It makes future checks easier and reassures everyone, but empty shells are harmless and grow out. What matters is that no live lice remain. Combing with conditioner and a metal comb beats picking them out dry.
Because the itch is an allergic reaction, not the lice, and takes one to two weeks to settle after the last louse is gone. The scalp has also been scratched and treated with something drying. Itching alone is not a reason to treat again. Finding a live louse is.
Check everyone the same day and treat the ones with live lice. Some doctors also treat anyone who shares a bed, even with no live lice found, because that contact is so close. Treating the whole household regardless is not recommended.
In order of likelihood: the second application was skipped, the product was misused, someone else in the house was not treated, reinfection came from the same friend or classroom, or the lice are resistant. Only the last is a reason to change medicine, so work through the other four first.
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