Scabies sounds as though it should be simple. A tiny mite called Sarcoptes scabiei gets into the outer layer of the skin. It creates a shallow burrow, lays eggs, and causes an intensely itchy reaction. Kill the mite, and you’re done. Except sometimes you’re not.
People can carefully treat scabies and still find themselves itching, scratching, seeing new spots, or wondering whether the infestation ever left. A large systematic review of 147 studies found an overall scabies treatment-failure rate of about 15%, although rates were lower with commonly used treatments such as permethrin and ivermectin. Interestingly, treatment failure reported in studies also increased over time.
That’s where chlorine dioxide becomes interesting, not because it has been established as a treatment for scabies, because it hasn’t. Rather, chlorine dioxide brings a very different kind of chemistry to a problem that isn’t always as simple as “kill one mite.” And that raises some questions worth asking.
First: What Does “Treatment Failure” Actually Mean?
This is more complicated than it sounds. Someone treats scabies and continues itching. Did the treatment fail? Maybe. But several different things can produce that result.
The treatment may not have reached every affected area. Living mites may have survived. Eggs may have survived and subsequently hatched. An untreated household member may have returned the infestation. Or the mites may actually be gone while the body’s immune reaction continues producing symptoms.
CDC guidance notes that itching can persist for several weeks after successful treatment because the itching results from a hypersensitivity reaction to mites and their feces. New burrows or new pimple-like lesions are more suggestive that retreatment may be necessary.
So, the first lesson is surprisingly important: Continued itching doesn’t necessarily mean continued scabies.
Then There Are the Eggs
This is where the mite’s life cycle becomes important. The female mite burrows just beneath the skin’s surface and deposits eggs. Some scabies treatments are better at killing mites than eggs.
Oral ivermectin, for example, has limited activity against the eggs. That’s why conventional treatment uses a second dose: the objective is partly to catch the next generation after eggs have hatched.
That gives us an interesting way to reconsider reports about chlorine dioxide.
Herb Roi Richards and others in the chlorine-dioxide community report that topical chlorine dioxide can kill scabies mites and their eggs.
The mite-killing claim deserves direct investigation. The egg-killing claim deserves even more. But suppose future research discovered that chlorine dioxide kills the mites without reliably killing their eggs. Repeated topical treatment could still conceivably produce a successful result.
The sequence could look something like this:
mites are exposed → susceptible mites die → some eggs remain → eggs hatch → subsequent treatment encounters the newly hatched mites → reproductive cycle is interrupted
Eventually, the infestation collapses.
To the person experiencing it, that could look exactly like: “It killed the mites and the eggs.” But biologically, something slightly different may have happened.
That’s the kind of distinction that only a proper experiment can resolve.

Where Chlorine Dioxide Becomes Particularly Interesting
Permethrin and ivermectin don’t attack scabies in the same way. Permethrin interferes with the mite’s nervous system. Ivermectin acts on parasite nerve and muscle function.
Chlorine dioxide is different. It’s a reactive oxidant.
That distinction could matter if chlorine dioxide were eventually demonstrated to have useful acaricidal activity against Sarcoptes scabiei at concentrations that human skin can safely tolerate.
We don’t currently have the clinical evidence necessary to say that it does. But if established scabies treatments sometimes fail, a substance operating through a fundamentally different chemical mechanism becomes an interesting research candidate.
Not necessarily a replacement. Another possibility.
Is Scabies Developing Treatment Resistance?
This question has received increasing attention. The 2024 systematic review found treatment failure across scabies studies, including about 10.8% for permethrin and 11.8% for oral ivermectin. Two-dose oral ivermectin had a substantially lower failure prevalence than single-dose treatment. Importantly, the authors found that none of the included studies actually assessed resistance, so treatment failure shouldn’t automatically be called drug resistance.
CDC guidance similarly notes several possible reasons for persistent symptoms, including incorrect application, poor penetration into thick crusted skin, reinfection and medication resistance. That’s an important distinction.
Treatment failure isn’t automatically resistance. But resistance is exactly why medicine benefits from having treatments that work through different mechanisms.
If an organism becomes less vulnerable to one attack, another completely different mechanism may still work. And that’s one reason chlorine dioxide deserves curiosity here.
Scabies Isn’t Necessarily Just a Mite Problem
Here’s another layer that makes the subject more interesting. Scabies makes people itch. People scratch. Scratching damages the skin. Once the protective skin barrier has been broken, bacteria can take advantage of the opportunity.
Researchers studying secondarily infected scabies lesions have recovered organisms including Staphylococcus aureus, group A streptococci, Pseudomonas, and several anaerobic bacteria.
The relationship may be even more interesting than scratching alone. Researchers have investigated how molecules produced by scabies mites may interfere with parts of the host immune defense and potentially help create an environment favorable to bacterial infection.
This matters because serious bacterial complications associated with scabies are well recognized, particularly in vulnerable populations.
So suddenly our simple problem, MITE → KILL MITE, looks more like:
mites + eggs + burrows + itching + scratching + damaged skin + microbial opportunity + immune reaction + reinfection
That’s quite a battlefield for something almost too small to see.
Could Chlorine Dioxide Potentially Address More Than One Part of That Battlefield?
This is where chlorine dioxide becomes more interesting than merely being another candidate mite killer. Its antimicrobial oxidative chemistry is already well established in disinfection and water-treatment applications.
That leads to a reasonable research question:
Could an appropriately formulated topical chlorine-dioxide treatment potentially affect both the mite infestation and some microorganisms associated with damaged scabies lesions?
We don’t presently have clinical evidence demonstrating that combination of effects in people with scabies.
And there is an especially important question:
What concentration could affect the mite without unnecessarily damaging or irritating already inflamed human skin?
Because antimicrobial strength isn’t enough. A useful topical treatment has to work and be tolerable to human tissue.
That’s precisely the kind of question laboratory and clinical studies should answer.
What About Herb’s “Inside and Outside” Approach?

Herb Roi Richards favors attacking scabies from both directions. In his approach, chlorine dioxide is used topically while an internal chlorine dioxide regimen is used simultaneously.
The idea is straightforward: Hit it from the outside and the inside.
I can understand the philosophy. But here’s where scabies biology raises an interesting question.
For ordinary scabies, the mites aren’t hiding deep inside the human body. They’re in the superficial skin. And we already know that ordinary scabies can be successfully eradicated using topical treatment alone. CDC currently lists topical 5% permethrin as a first-line treatment, with oral ivermectin as another option.
So, if topical chlorine dioxide eventually proves effective, we’d still need to answer:
Does adding internal chlorine dioxide actually improve the outcome?
At present, I don’t think we know.
That doesn’t mean Herb’s combined approach is wrong. It means that topical chlorine dioxide alone versus topical-plus-internal chlorine dioxide would make an interesting comparison if this approach were ever formally studied.
And there is one situation where Herb’s “both sides” instinct has an interesting conventional parallel.
When Scabies Becomes Extreme
Crusted scabies is a very different problem. Instead of the relatively small mite population associated with classic scabies, someone with crusted scabies may carry hundreds of thousands or even up to two million mites and eggs. The thick crusting can also make topical penetration difficult.
What does conventional medicine do? It attacks from both directions.
CDC recommends oral ivermectin together with a topical agent such as permethrin for crusted scabies.
That doesn’t demonstrate that oral chlorine dioxide works. But it does demonstrate something interesting about Herb’s general instinct:
There are circumstances in which attacking a difficult scabies infestation both systemically and topically makes biological sense.
For ordinary scabies, whether chlorine dioxide needs both routes remains unanswered.
Don’t Forget the Other Humans
There’s another reason apparently successful treatment can fail. You can kill every mite on one person and acquire scabies again from somebody else.
Close household and sexual contacts therefore matter enormously. CDC recommends addressing close contacts at the same time and washing or isolating clothing, towels and bedding appropriately. Scabies mites generally survive only about two or three days away from human skin.
That’s important regardless of what treatment someone uses.
No topical substance can prevent another untreated person from handing the mites back.
Maybe Chlorine Dioxide Isn’t Needed
That’s worth saying too. We already have established scabies treatments. Permethrin works. Ivermectin works. Other alternatives exist.
For many people, there’s little reason to go searching for an experimental substitute. But that’s not quite the end of the story.
- Some treatments fail.
- Some infestations return.
- Some people cannot tolerate particular treatments.
- Severe crusted scabies can be remarkably difficult.
- Treatment failure appears often enough to remain an active problem.
And wherever treatment failure or genuine resistance exists, it is reasonable for researchers to investigate agents that operate through different mechanisms.
That’s where chlorine dioxide becomes interesting.
A Candidate Waiting for the Right Experiments
The chlorine-dioxide community has supplied the observation:
People report using topical chlorine dioxide against scabies and getting results.
Herb Roi Richards goes farther and recommends attacking the problem both topically and internally. Neither observation establishes efficacy. But they give us some remarkably straightforward experiments to perform.
- Does chlorine dioxide kill Sarcoptes scabiei mites?
- Does it kill their eggs?
- At what concentration?
- How quickly?
- Can that concentration be safely tolerated by human skin?
- Does it penetrate the shallow burrows sufficiently?
- If eggs survive, can repeated treatment interrupt the lifecycle by killing newly hatched mites?
- Does it work against mites that respond poorly to permethrin?
- Does its antimicrobial action provide any useful secondary benefit to damaged skin?
- And does adding an internal component improve outcomes over topical treatment alone?
Those aren’t impossible questions. They’re laboratory questions. And remarkably, I couldn’t find good published clinical research answering them.
When the Usual Treatment Doesn’t Work
Perhaps chlorine dioxide doesn’t need to become the next standard treatment for scabies. We already have good treatments. The more interesting possibility is narrower.
If chlorine dioxide can be shown to possess useful topical acaricidal activity, its oxidative mechanism could potentially provide researchers with another tool when conventional treatment fails, can’t be tolerated, or eventually encounters genuine resistance.
Maybe Herb’s reported results have a straightforward explanation. Maybe chlorine dioxide kills mites. Maybe it interrupts their lifecycle. Maybe repeated application is doing something different from what users assume.
Maybe its usefulness has more to do with the complicated environment surrounding a persistent infestation. Or perhaps controlled testing will show that it simply isn’t a particularly good scabies treatment.
We won’t know until somebody performs the right experiments.
But when an inexpensive substance with a very different mechanism develops a persistent reputation for helping with a condition in which treatment failure remains a recognized problem, the most useful response isn’t necessarily to declare it a cure. Nor is it to dismiss it.
Sometimes the appropriate response is considerably simpler:
Put it under the microscope and find out.
Informational notice: Chlorine dioxide is not an established or approved treatment for human scabies, and this article is discussing it as a research candidate rather than providing a treatment protocol. Established prescription scabies treatments include topical permethrin and oral ivermectin; crusted scabies requires prompt medical care because of its high mite burden, contagiousness, and risk of complications.
















