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Belly Health, Rosacea, and A Starring Role for Mites

You might want to wash your hands before reading this. Start by placing your fingertip to your cheek. Go ahead, really. Now slowly move it toward your lips and into your mouth, paying attention to the uninterrupted inward turn of skin as it changes from cheek to lip to mucous membrane. You probably never thought about this (and may wish you never had), but your skin continues right into your mouth, down your esophagus, into your stomach, and on through intestines (both small and large), rectum, and anus before turning skin-side out again. It’s continuous.

Picture a hollow cylinder, skin on the outside and gastrointestinal tract on the inner wall. Just keep in mind why some clever gastroenterologist once remarked about his profession, “We’re all really just internal dermatologists, aren’t we?”

Various fields of alternative medicine (naturopathic medicine, traditional Chinese medicine, homeopathy) have always considered skin health and intestinal health to be intimately connected.  Skin inflammation such as acne or rosacea will always be connected to something “off” with digestion. In fact most people with chronic skin conditions quickly discover that certain foods exacerbate (or improve) their skin situation.

Until recently, though, conventional dermatologists and gastroenterologists were not in communication much. But some fresh research about the very difficult-to-treat skin condition rosacea has changed this.

Rosacea’s connection to mites
You know what rosacea looks like, ranging from the mild flush on the cheek of a fetching Irish lass (rosacea has been called “the Celtic curse”) to the unfortunate nose of a W.C. Fields-type tippler. For years doctors knew that steroid creams helped (by reducing inflammation), as did an anti-parasite medication applied topically (metronidazole). So did the antibiotics used for acne, especially clindamycin. They also knew that many people with Crohn’s disease had rosacea but didn’t understand why.

What exactly was going on?

Some recent research has shown that to a greater or lesser extent, our skin is inhabited by an organism called a skin mite, a tiny little microscopic thing living around our hair follicles, eyelashes, and eyebrows. We’ve all got these mites, and their population increases as we get older. They’re called Demodex (their Latin name) and for most of us they’re harmless fellow travelers, just like many of the countless microbes we carry with us. Under a microscope, the Demodex mite looks like this.

If you’ve got rosacea, your dermatologist might prescribe the anti-parasite drug metronidazole to reduce your Demodex population, sometimes adding an antibacterial antibiotic, which doesn’t kill the mites but does seem to help.

Here’s why: like all of us, the Demodex mite has its own wee digestive system. After it eats (a teeny little bit of you), just like you it needs to empty its intestines. And just as you have a lot of bacteria in your bowel movement, so does Demodex. You have your e. Coli, Lactobacillus, and Bifidobacter. Your Demodex mite excretes small but significant amounts of the bacterium Bacillus oleronius, among others. And for certain susceptible individuals (Celts, people who drink too much alcohol, people under stress), this bacterium causes an inflammatory reaction on the skin that we know as rosacea.

If the metronidazole isn’t working against the mites, taking an antibiotic like Clindamycin kills off the B. oleronius and your rosacea improves. But the result is only temporary, and the meds often don’t work as well as they should. Why the rosacea keeps returning has been a puzzle. But science is solving it.

Given that we’re all singularly unhygienic, prone to rubbing our eyebrows and then putting our fingers in our mouths, we inadvertently swallow some of the B. oleronius from the Demodex bowel movement and down it travels, into our intestines. There, in utter darkness, endless moisture, and with lots to eat, it grows like crazy. And it seems that this endless cycle of Demodex emptying its intestinal contents and you guiding them into your own intestines allows the rosacea to return after what originally seemed to be a successful treatment.

How did researchers figure this out?
Stay with me here. Scientists recently discovered that the rosacea-linked B. oleronius is one of several bacteria responsible for a not-uncommon digestive condition called “small bowel intestinal overgrowth,” SIBO for short. In a healthy small intestine, there really should be no bacteria, but sometimes people with chronic digestive symptoms do have bacterial overgrowth. SIBO is diagnosed by finding excessive amounts of hydrogen or methane gas in your breath using the unsurprisingly named “Hydrogen/Methane Breath Test,” in which a sample of your breath is collected in a vacuum tube and sent to a lab for analysis. We do this test at WholeHealth Chicago, but your insurance won’t cover it (“experimental,” they say). The cost is about $150.

What’s important here is that people with SIBO almost always have an abnormal breath test. But the big news is that recent studies have shown that rosacea patients–even with no digestive symptoms at all–have the same abnormal breath test as SIBO patients. In other words, the symptoms on the skin and the symptoms in the small intestine have the same source: a bacterium from the intestines of the Demodex mite.

Now tell me that isn’t interesting!

This is all good news for people with rosacea, a group usually quite unhappy with the state of their skin. It means that an antibiotic specifically designed for SIBO should theoretically clear their rosacea. And it does.

Xifaxan (rifaximin) is an intestinal antibiotic that works only within your intestine—it’s not absorbed into your bloodstream. And when Xifaxan is given to rosacea patients, it does indeed clear most, though not all, skin lesions. Why not all? Because Xifaxan doesn’t kill certain species of bacteria from the Demodex mite intestine. In this situation, you need metronidazole for complete coverage.

On the down side, while the results can be dramatic they may not be permanent. It’s virtually impossible to clear every remaining mite, and once you stop taking the metronidazole, the mites do start proliferating again, having their little mite bowel movements. Predictably, the B. oleronius starts proliferating too. But since Xifaxan is quite safe (it seems to let good-guy gut bacteria alone), when rosacea flares patients can start new courses of Xifaxan and metronidazole.

Now you’ve got to admit that even though you may not have rosacea, the idea that the bacteria in the bowel movement of a mite living near the hair follicles of your eyebrows and eyelashes could be responsible not only for a chronic skin condition but also for a chronic digestive condition is an interesting idea. Something you’d hear on “House.”

Isn’t it interesting?

Really, isn’t it?

Be well,

David Edelberg, MD


Posted in B, Blog, Knowledge Base, R Tagged with: , , ,
14 comments on “Belly Health, Rosacea, and A Starring Role for Mites
  1. Bee says:

    What is a natural approach that can be taken? I refuse to take any antibiotics…they have destroyed my health and my gut. And I react poorly to supplements

    If u eat a healthy, plant-based diet, u can change ur gut flora back to optimal, sans antibiotics and supplements.

    Do u advocate a diet similar to Dr Fuhrman’s Eat to Live? The results from his nutritional research and testimonials is outstanding!

  2. Joanne Boylan says:

    This is so interesting. I’m wondering about my dry eyes, which they say is caused by blockage in my meibomian glands, (this is also linked to people with roascea), if trying this course of treatment will help?

  3. Dr E says:

    To Bee
    A healthy diet is always a good idea
    To Joanne
    It might be worthwhile trying a rosacea treatment for you

  4. stacy says:

    Can this mite affect follicles? I get horrible brow/lash inflammation and sores that makes them fall out. It also causes anxiety. I have colitis and dysbiosis, so i wonder if there is a correlation. Is there? How would this be treated? Are RX drugs necessary, or are there natural methods?

  5. Lisa Romano says:

    Yes, it’s not only interesting but quite amazing! And I thank you for bringing that discovery to my attention and explaining it in a way my wee brain can understand.

  6. kishor says:

    Does it spread from one person to other. I am from india.
    I have rosacea, also can you please tell me that movement under skin is also one of its symptoms.

  7. Kathy says:

    I read recently that there’s also a connection between rosacea and h-pylori. I was diagnosed with both over 10 years ago. Four dermotologists yet nothing ever helped the rosacea but I was treated for h-pylori. I have also suffered with severe itching from head to toe for close to 15 years. I’ve taken zydec daily to keep it under control all these years. I’ve been experiencing excessive indigestion and heartburn over the past few weeks and will be seeing my GI Dr next week. Maybe I’ll get lucky and find that all my ailments are related and they will all be treated and go away! Thanks for the great article!

  8. MK says:

    The Fast Track Diet for IBS is having tremendous success in helping people with GERD, IBS, and SIBO control, including reduction in Rosacea and Ocular rosacea! You need to control specific foods that have a high fermentation potential by these bacteria but the diet is VERY doable and in many ways seems much easier than GAPS, SCD, FODMAP and other “gut healing” diets. I hope this helps someone. It is really helping me with my SIBO symptoms

  9. alice enichen says:

    What is SIBO? Would like more comments.

  10. Dr. R says:

    Please refer to the paragraphs below this heading in the article above. “How did researchers figure this out?”

  11. Mariana griffith says:

    I do have all theses sympto,s since three months ago, I can stopped the itching in my face the burning red checks and the feeling that so,etching is rolling under my skin. I started thes symptoms while I was i. The third day of taking metronidazole .i was taking in as I normally I do every 3 years to kill any possible intestine parasite. And boom this itching and swelled face started. And now is in my lips and burns and I can’t stop it. I need help where I can go ? I’m traveling all over USA now I’m in the state of Iowans going to minnesota thanks if you can give me some advise

  12. Joanne Ahrendt says:

    I had food poisoning 10 years ago in the Dominican & within a year a small mark came up on my skin which has got bigger and bigger and I have had many different diagnosis such as BCC, Actinic Keratosis and even being told I just have Bad Skin, 8 years later with pain in my stomach I went to a new doctor who gave me a test and found H.Pylori which was eradicated, this was 2 years ago but still in pain I had an endoscopy 3 months later which found I had Erosive Gastitiis all over my stomach. I have also had excruciating migraines from bright lights and dry eyes and my dermatoloist has given me a final diagnosis of Granular Rosacea and as my scar is now very big and growing in to my eyebrow he has broached the idea of Cosmetic Surgery and said he will bring this up at a meeting with other drs and a plastic Surgeon to see if this can be done. I’m glad I have a name and information to fight this with now but WOW who would think a little bug could lead to all this and do so much damage and since reading up on this nasty little ailment I’m never more than 3 feet away from antibiotic wipes lol.

  13. Navin says:

    Since last one and half year I have suffered from démodé mites and seen doctors and no one believes, but l would like solution to my sickness. I have scalp folliculities itchy skin and rash. I have used permethrin cream and tea tree oil but only little relief

  14. Dr E says:

    Hi Navin
    You can order the Hydrogen Breath Test from this lab (or the lab can refer you to a doctor in your area who can order it for you
    If the test is “positive,” then a course of Xifaxan (mentioned above) would clear the abnormal bacteria (and hopefully the mites)

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