Microscopic, eight-legged creatures are living in your hair follicles right now. This might sound unsettling — but it's completely normal. All adults have demodex mites on their skin. The question isn't whether you have them, but when they start causing problems.
What are demodex mites in humans — and who has them?
Demodex mites in humans are microscopic mites that live in and around hair follicles on the face. They are not parasites in the traditional sense — they are a stable part of the skin's normal microbiome. A DNA study showed that 100% of all adults over 18 carry demodex mites, and that the prevalence increases with age, so all people over 60-70 years old have them in measurable quantities.
Humans host two species:
Demodex folliculorum is the larger of the two — about 0.4 mm long. It lives within the hair follicle, usually in groups, and is primarily found on the nose, cheeks, forehead, and chin. This is the species most often associated with skin problems on the face.
Demodex brevis is half the size and lives deeper inside the sebaceous glands. It lives individually and is more common on the neck and chest than D. folliculorum.
Both species feed on sebum — the oil your skin naturally produces. They are active at night, crawling out of the hair follicles to mate on the skin surface and then retreating during the day.
The life cycle of the demodex mite — and why balance is important
Demodex mites have a shorter life cycle than most people imagine. From egg laying to a new generation being ready, it takes 14-20 days. Larvae hatch after 3-4 days, and they are fully developed adults within another 7 days. An adult female can live for two months and lay more than 20 eggs in her lifetime.
Under normal circumstances, the immune system and the skin's natural balance keep the mites at a low and harmless level. A density of less than 5 mites per square centimeter is considered normal. Research shows that it is typically above this threshold that mites begin to play an active role in skin inflammation.
The problem arises when something disrupts this balance. Mites begin to multiply faster than the skin can keep them in check — and that's when you notice it.
The 4 factors that give demodex mites free rein
Overpopulation of demodex mites rarely occurs without reason. There is almost always one or more triggering factors behind it:
1. Rich and heavy facial creams
Demodex feeds on sebum. When you apply rich products, you give them extra nourishment. Heavy, occlusive creams — especially those with a lot of mineral oil or lanolin — can significantly promote mite reproduction.
2. Corticosteroids (adrenal cortex hormone creams)
The use of steroid creams on the face is one of the most well-known triggering factors. Steroids temporarily suppress the immune system's control over the mites — and when you stop using them, it can trigger a strong resurgence.
3. Weakened immune system
Chronic stress, sleep deprivation, illness, or immunosuppressive medication provide better conditions for mites. The immune system is normally the most important brake on the demodex population.
4. Incomplete facial cleansing
As research from PMC shows, lack of cleansing directly promotes mite growth: the accumulation of sebum and dead skin cells is a buffet for demodex. Moisturizing is not enough — the skin must be cleansed properly, yet gently.
Zinc and sulfur — the two substances demodex doesn't like
ZZ-Creme is formulated with zinc oxide and sulfur — precisely the active ingredients used clinically for demodex-related skin problems. Used as a night cream and works while you sleep.
See ZZ-Creme →Symptoms of too many demodex mites on the face
The most characteristic symptom is a sensation of something crawling on the skin — especially in the evening and at night, when the mites are most active. But there are several other signs to look out for:
Persistent redness: Mites that multiply rapidly trigger inflammation in the hair follicles. The result can resemble rosacea or general redness that does not respond to normal soothing care.
Enlarged and clogged pores: When many mites live in the same hair follicle, pores can become visibly enlarged and dark — especially on the nose, forehead, and cheeks.
Pimples and bumps that do not respond to standard treatment: Acne-like breakouts that do not improve with salicylic acid or benzoyl peroxide may be due to demodex and not bacteria.
Itching and stinging: A burning or itching sensation on the face — without any other obvious cause — is a classic indication. It can be confused with rosacea redness or an allergic reaction.
It is important to mention that none of these symptoms exclusively point to demodex. The condition — technically called demodicosis — must be considered in conjunction with your overall skin history. If you are in doubt, you can read more about how demodex mites are linked to rosacea, perioral dermatitis, and acne.
What to look for in products — and what to avoid
Treating demodex-related skin problems is about creating conditions that inhibit mite growth — not about eradicating all the mites completely.
Ingredients that work against demodex:
Zinc oxide has a documented effect against inflammation and makes the environment in the hair follicles less favorable for mites. It is one of the cornerstones of ZZ-Creme, which is used as a night treatment.
Sulfur is one of the oldest known remedies for skin parasites and has shown effectiveness in clinical studies against demodex folliculorum. Typically used in concentrations of 5-10% in creams.
Tea tree oil (TTO) is used as a supplement, but should be heavily diluted — pure tea tree oil is too aggressive for daily use on the face.
Ivermectin is a prescription medication that your doctor can prescribe for severe cases. It actively kills mites and is particularly relevant for demodicosis with secondary bacterial infection.
Ingredients you should avoid if demodex is suspected:
Heavy mineral oils, lanolin, silicone oil, and rich night creams based primarily on fats can promote mite growth. Also avoid strong steroids on the face without medical guidance — they can create a vicious cycle where mites flourish when treatment is stopped.
When should you seek medical help?
Most people with mild demodex overgrowth can manage the condition with the right products at home. But there are situations where it is wise to consult a doctor or dermatologist:
Seek help if symptoms are severe and do not improve after 8-12 weeks of consistent treatment with zinc and sulfur-containing products. If you experience significant swelling, thickened skin, or severe pustular outbreaks on the face, it may be a sign of a more serious demodicosis that requires a prescription for ivermectin cream.
Demodex can also affect the eye area and cause symptoms such as itchy, red eyelids, dry eyes, or a gritty sensation in the eyes — this is called Demodex blepharitis. In this case, you should see an ophthalmologist, not a dermatologist.
If you experience a severe flare-up of demodex symptoms without a clear cause, it may also be a sign of an underlying immune problem that should be investigated.
Frequently asked questions about demodex mites in humans
Do all humans have demodex mites?
Yes. A DNA study found demodex mites in 100% of all tested adults over 18. Younger people and infants have them less frequently — but from adolescence onwards, the prevalence steadily increases. The mites are typically transferred from parent to child in the first years of life.
What are the symptoms of too many demodex mites?
The most common symptoms are persistent redness, itching or burning sensation on the face (especially at night), enlarged pores, pimples that do not respond to normal treatment, and a general sensation of something crawling on the skin. The condition is called demodicosis.
How do you treat demodex mites at home?
The most effective home treatment is products with zinc oxide and/or sulfur used as a night cream — these directly inhibit mite growth. In addition, thorough but gentle evening cleansing is important. The treatment period is typically 90-120 days, as the mites' life cycle must go through several times.
Can you see demodex mites with the naked eye?
No. Demodex folliculorum is only 0.4 mm long, and Demodex brevis is half that size. They are invisible to the naked eye. Diagnosis is made by skin scraping and microscopic examination by a dermatologist, or via DNA analysis.
Are demodex mites contagious?
Yes, but very little. Transmission primarily occurs through close skin contact — typically between parents and children in the early years of life. Sharing towels or pillowcases with a person with severe demodicosis can theoretically transmit mites, but everyday contact does not pose a practical risk of infection for adults.
When are demodex mites a sign of something serious?
A high number of demodex mites is seen more frequently in people with weakened immune systems — for example, with HIV, cancer, or long-term immunosuppressive treatment. If you are generally healthy and have mild to moderate symptoms, it is usually a local imbalance in the skin rather than a systemic problem.
What is the difference between Demodex folliculorum and Demodex brevis?
Demodex folliculorum is the larger of the two species (0.4 mm) and lives in the hair follicles, primarily on the face. Demodex brevis is only 0.2 mm and lives deeper inside the sebaceous glands, more frequently on the neck and chest. Both can cause problems, but D. folliculorum is the species most often associated with facial redness and rosacea-like symptoms.
Ready to restore balance?
ZZ-Creme contains zinc oxide and sulfur — the two ingredients clinically used for demodex overgrowth. Use it as an evening treatment and give your skin peace to restore its balance overnight.
Try ZZ-Creme →References
- Thoemmes MS, Fergus DJ, Urban J, Trautwein M, Dunn RR — Ubiquity and Diversity of Human-Associated Demodex Mites (2014). PLOS ONE.
- Akdeniz N, Çiçek D, Başay MF et al. — Human Demodex Mite: The Versatile Mite of Dermatological Importance (2014). Clinics in Dermatology / PMC.
- Cleveland Clinic Medical Team — Demodex Face Mites: Folliculorum, Brevis & Treatment (2022). Cleveland Clinic.
- Videnskab.dk — Mites in your face reveal where you come from (2015). Videnskab.dk.
- Demodex.dk — Hair Follicle Mites — facts and treatment. Demodex.dk.
