There Could Be Mites Living on Your Face Right Now: What Demodex Means for Your Skin
Key takeaways
- Demodex mites are microscopic arachnids that live in hair follicles and oil glands, mostly on the face. They're common in adults, often without any sign they're there.
- At low numbers they've long been considered harmless. Overgrowth is strongly linked to rosacea and skin inflammation.
- At Parallel Health, every plan is built around your own microbiome results, with personalized formulations and, where appropriate, custom compounded Rx designed to rebalance the skin and rebuild its barrier.
What are Demodex mites?
Demodex mites are microscopic arachnids that live in human hair follicles and oil glands, mostly on the face. Two species live on people: Demodex folliculorum, which gathers in hair follicles, and Demodex brevis, which settles deeper in the oil glands. Each adult mite is about a third of a millimeter long, too small to see without a microscope.
They're common in adults, often without any sign they're there. In a 2014 study, researchers could see mites on about 14 percent of the people they examined, but found mite DNA on far more of them once they tested for it (1). Mites become more common with age and are rare in young children (2).
How Demodex mites live on your skin
Demodex spend the day head-down in the follicle, feeding on sebum, the oil your skin makes. After dark, they crawl out across the skin to find a mate, then return to a follicle. A 2022 study that sequenced the full D. folliculorum genome found that this night-time rhythm appears to be guided by the melatonin your skin releases in the evening (3).
The same study corrected a long-standing myth. Scientists had believed the mites had no way to get rid of waste, so it built up inside them and spilled into your pores when they died. The genome team showed that was wrong (3).
When Demodex becomes a problem: rosacea and inflammation
Demodex have long been considered harmless residents, but there's growing evidence that trouble starts when they overgrow. Dermatologists often use five mites per square centimeter of skin as a threshold for concern (4). A review of 23 studies found that people with rosacea were about nine times more likely to have a Demodex infestation, with around eight times as many mites per square centimeter (5).
The mites may not act alone. Bacteria carried by Demodex, including Bacillus oleronius, can trigger an immune response in many people with papulopustular rosacea (6). And in a trial of 962 people, an antiparasitic ivermectin cream outperformed a standard rosacea treatment (7). Scientists are still working out whether the mites help drive rosacea or thrive because of it.
Demodex and your skin barrier
Your skin's ecosystem goes well beyond bacteria. Viruses, fungi, mites and other microbes live there too, and when one group gets out of balance, your skin barrier and immune system feel it. A strong, healthy barrier helps keep that whole community in balance.
How Parallel Health approaches Demodex
Our skin microbiome testing detects the bacteria, viruses, fungi, parasites and other microbes living on your skin, including Demodex. In our own sequencing data, we're seeing signs that Demodex may play a bigger role in skin inflammation than it gets credit for, and we're digging in further.
Every MD-03 Protocol™ plan is built around your own microbiome results, with personalized formulations and, when your dermatologist decides it fits, custom compounded Rx matched to your skin and lifestyle. The goal is the same for everyone: bring the skin's ecosystem back into balance and help it rebuild a strong, resilient barrier. This is Microbiome Dermatology™ in practice.
Frequently asked questions
Does everyone have Demodex mites? Not everyone. They're common in adults but rare in young children, and how often they're found depends a lot on the testing method used.
Can you feel Demodex mites? Usually not. In healthy numbers they cause no symptoms. Overgrowth can show up as redness, itching, a rough or sandpaper-like texture, small bumps, or irritated eyelids.
Do Demodex mites cause rosacea? People with rosacea carry far more mites on average, and mite-related bacteria can trigger inflammation. Researchers haven't yet proven whether the mites cause rosacea or flourish on skin that's already inflamed.
How do you test for Demodex mites? Dermatologists often use a standardized skin surface biopsy, where a drop of adhesive on a glass slide lifts the contents of the follicles for counting under a microscope. DNA-based skin microbiome testing can also detect mites, along with the bacteria, viruses, fungi, parasites and other microbes on your skin.
Can you get rid of Demodex mites? The aim usually is to bring mite numbers back into a healthy range rather than wipe them out. Options range from prescription topicals to barrier-supportive skincare, and the right mix depends on your skin, so work with a dermatologist to choose. If you would like to see a dermatologist with Parallel Health, you can sign up for the MD-03 Protocol™, which includes dermatology via telehealth.
References
- Thoemmes MS, Fergus DJ, Urban J, Trautwein M, Dunn RR. Ubiquity and diversity of human-associated Demodex mites. PLoS One. 2014;9(8):e106265. doi:10.1371/journal.pone.0106265
- Li J, Luo X, Liao Y, Liang L. Age differences in ocular demodicosis: Demodex profiles and clinical manifestations. Ann Transl Med. 2021;9(9):791. PMID: 34268404
- Smith G, Manzano-Marín A, Reyes-Prieto M, et al. Human follicular mites: ectoparasites becoming symbionts. Mol Biol Evol. 2022;39(6):msac125. doi:10.1093/molbev/msac125
- Forton F, Seys B. Density of Demodex folliculorum in rosacea: a case-control study using standardized skin-surface biopsy. Br J Dermatol. 1993;128(6):650-659.
- Chang YS, Huang YC. Role of Demodex mite infestation in rosacea: a systematic review and meta-analysis. J Am Acad Dermatol. 2017;77(3):441-447.e6. doi:10.1016/j.jaad.2017.03.040
- Lacey N, Delaney S, Kavanagh K, Powell FC. Mite-related bacterial antigens stimulate inflammatory cells in rosacea. Br J Dermatol. 2007;157(3):474-481. doi:10.1111/j.1365-2133.2007.08028.x
- Taieb A, Ortonne JP, Ruzicka T, et al. Superiority of ivermectin 1% cream over metronidazole 0.75% cream in treating inflammatory lesions of rosacea: a randomized, investigator-blinded trial. Br J Dermatol. 2015;172(4):1103-1110.
