Almost everyone has Demodex mites on the face. Medical Director Dr Sin Yong explains when they inflame the skin, how they relate to rosacea and how numbers are brought back down.
WhatsApp to Enquire →Key facts ↓Demodex mites are microscopic mites that live in the hair follicles and oil glands of almost every adult face, usually without causing problems. When their numbers rise too high, they can cause demodicosis: rough, itchy skin, rosacea-like bumps or inflamed eyelids. They are tested by counting them on a skin sample, and treated with prescription creams and by removing triggers. Rosacea redness is treated separately.
Demodex mites are microscopic relatives of spiders that live in human hair follicles and oil glands, mostly on the face. Two species live on people. Demodex folliculorum lives in the upper part of hair follicles, often several together, with their tails sticking out of the pore. Demodex brevis is shorter and lives deeper, in the oil glands. Both feed on sebum and the cells lining the follicle, are most active at night, and complete their life cycle in about two weeks.
They are passed on through close contact early in life, and almost every adult carries them. Numbers rise with age and are highest where the skin is oiliest: the cheeks, nose, forehead, chin and the eyelashes. In most people they cause no problems at all and are simply part of the skin’s normal population, alongside bacteria and yeast.
Trouble starts when the number of mites rises well above normal, or when the skin’s immune response to them changes. Doctors call this demodicosis. It can look like a stubborn rash, like rosacea, or like blepharitis on the lid margins, and it is one of the reasons a red, bumpy face does not respond to ordinary acne treatment.
Yes, when there are too many. A high density of Demodex has been found repeatedly in people with papulopustular rosacea, and mite-related skin disease is now classified into primary demodicosis, which appears on otherwise normal skin, and secondary demodicosis, which follows something that weakens local immunity. The table sets out how it usually shows.
| Pattern | What you may notice | Often linked with |
|---|---|---|
| Rough, “sandpaper” skin (pityriasis folliculorum) | Fine scale and tiny plugs in the pores, dryness, itch or a crawling feeling, worse at night | Heavy creams, little cleansing, older age |
| Rosacea-like bumps | Small red papules and pustules on the cheeks and nose, often with burning | Papulopustular rosacea; high mite density |
| Rash after steroid creams | Redness and small bumps that flare when a steroid cream is stopped | Long use of steroid creams on the face |
| Eyelid inflammation (Demodex blepharitis) | Itchy, red lid margins, crusting at the base of the lashes, gritty eyes | Rosacea, older age, eye make-up habits |
| Widespread or unusual rash | Spreading bumps that do not behave like acne or rosacea | Reduced immunity from illness or medicines |
The mites are not thought to be the whole story. Their bodies carry bacteria and release substances that provoke the skin’s innate immune system, and skin that is already reactive, as in rosacea, may tolerate them less well. Whether mites start the inflammation or flourish because of it is still debated; in practice, lowering their numbers often helps.
Rosacea is a long-term inflammatory condition of the central face, with flushing, persistent redness and, in some people, bumps and pustules. People with rosacea carry, on average, many more Demodex mites per square centimetre of skin than people without it, and treatments that reduce the mites can settle the bumps. This is why one of the prescription creams used for rosacea, ivermectin, works partly by acting on the mites, and partly by reducing inflammation.
Mites are not the cause of every feature of rosacea. Flushing and fixed redness come from the blood vessels, and they do not respond to anti-mite treatment. A full rosacea plan therefore treats each feature on its own terms, as set out in rosacea treatment in Singapore. How rosacea differs from acne, which it is often mistaken for, is covered in rosacea vs acne.
Mites cannot be seen with the naked eye, and their presence alone proves nothing because almost everyone has them. What matters is the density. The usual test is a standardised skin surface biopsy: a drop of cyanoacrylate glue on a glass slide is pressed onto the skin for about a minute and lifted off, bringing the upper follicle contents with it. The mites in a set area are then counted under a microscope. The test is quick and not painful. For the eyelids, an eye doctor may remove a few lashes and examine their bases, or look for cylindrical dandruff around the lashes with a slit lamp.
In practice the diagnosis is often made on the pattern: rough skin with tiny follicular plugs, itch, a rosacea-like rash that has not responded to the usual treatment, or a flare after stopping a steroid cream. A response to anti-mite treatment supports it.
The aim is to bring numbers back to normal, not to eradicate the mites, which return to some degree in everyone. Treatment is chosen after assessment and depends on the pattern.
Washing twice a day with a gentle cleanser is sensible, but scrubbing harder does not remove mites that live inside the follicle, and harsh products can damage the barrier and make reactive skin worse.
“Everyone has face mites. The question is never whether they are there, but whether there are too many for the skin to tolerate.”
General clinical observations used at consultation; they describe what is checked, not any individual result.
A mite-related rash is uncomfortable but not dangerous. Some symptoms need prompt medical attention whatever the cause.
Where any of these apply, the first step is a diagnosis and, if needed, referral to the right specialist.
At IN Eternity Clinic, Medical Director Dr Sin Yong examines the skin to work out whether a rough, red or bumpy face is demodicosis, rosacea, acne, fungal folliculitis or dermatitis, or a mix. Where mites are likely to be part of the problem, treatment is prescribed after assessment, triggers are removed, and redness is treated as a separate step once the skin has calmed. Eye symptoms are referred to an eye doctor. Cost depends on the treatments needed and is explained after assessment; the consultation fee is S$120, waived with any medical treatment.
To have a red or bumpy face looked at in person, book an assessment with Dr Sin Yong at IN Eternity Clinic on Orchard Road, or message the clinic on WhatsApp.
Almost every adult does. Demodex mites are passed on through close contact early in life and live in hair follicles and oil glands, mostly on the face. They usually cause no symptoms. Problems arise when their numbers rise well above normal.
Rough, slightly scaly skin with tiny plugs in the pores, itch or a crawling feeling, small red bumps and pustules on the central face, and red, crusty eyelid margins. These overlap with rosacea and acne, so an examination is needed.
They are part of the picture for many people with rosacea bumps, who have much higher mite counts, and anti-mite treatment can help those bumps. Flushing and fixed redness come from blood vessels and are treated separately. Mites are not thought to be the only cause.
Usually with a standardised skin surface biopsy: a drop of glue on a slide is pressed onto the skin and lifted, and the mites in a set area are counted under a microscope. For the eyelids, an eye doctor may examine a few lashes.
No, and that is not the aim. Everyone carries some. Treatment lowers the number back to a level the skin tolerates, using prescription creams and removing triggers such as steroid creams and heavy products. Some people need maintenance.
No. Pets carry their own Demodex species, which do not live on human skin. Human mites spread between people through close contact, and almost everyone already has them.
They are most active at night, when they move along the skin surface to mate before returning to the follicles. This is one reason itch from demodicosis can feel worse in the evening.
Cost depends on the pattern: prescription creams alone, or treatment for rosacea redness as well. It is explained after assessment. At IN Eternity Clinic the consultation fee is S$120, waived with any medical treatment.
IN Eternity Clinic, 9 Scotts Road, #12-01 Pacific Plaza, Singapore 228210. By appointment with Medical Director Dr Sin Yong. Monday to Saturday, 11am to 8pm. WhatsApp or call +65 8815 3008. The consultation fee is waived with any medical treatment.
These sources describe mechanisms and general evidence. They are not a promise of any individual result; suitability is decided at an in-person assessment.