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Demodex Q&A
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Demodex Q&A

1. What are Face mites?
Face mites are also known as Demodex. They live in a person skin, particularly on the face where ample food provides the best opportunity for breeding.

2. Where do Demodex live?
Demodex live in Hair roots and sebaceous glands which is 2mm to 3 mm under the skin surface.

3. How big is a Demodex?
A male is 0.165mm-0.27mm, and a female is 0.278mm-0.294mmm. We cannot see a Demodex by naked eyes, but we can see it when we magnify around 40 times with a microscope. We can identify their hands and feet are moving at around 300 times magnification.

4. Where do Demodex live?
Demodex mites can live all body parts wherever there are hair roots and sebaceous glands. It is easy for them to breed in the T-zone (forehead, nose, and mouth area) and hair growing part where secretion of sebum is prosperous especially.

5. Are there different kind of Demodex?
Yes, there are two kinds. One is called Demodex folliculorum and the other is called Demodex Brevis.

6. What is the difference of Demodex folliculorum and Demodex brevis?
Demodex folliculorum live in hair roots, and Demodex brevis live in sebaceous glands. Not only a difference of where they live, but also shape and size are different. Folliculorum is long and narrow, Brevis is small.

7. When was Demodex discovered in human skin?
Demodex folliculorum was found in 1842 and Demodex brevis was found in 1963 in human skin.

8. How fast does Demodex increase?
From mating to laying-eggs takes 12 hours. From an egg to a larva takes 60 hours, then larva become an embryo. It takes about 10 to 13 days from egg to embryo. A female continues laying eggs after that, and it is said that the number increases exponentially.

9. How do Demodex Folliculorum influence our hair?
Demodex Folliculorum living in hair root opens a hole on a wall of the follicle, and absorbs part of the hair root as food. Therefore a pore widens making it easy for the hair to fall out and the scalp becomes polluted by excrement and / or corpse of the mite. It is one factor of inflammation around hair root and hair loss.

10. How do Demodex Brevis influence to our hair?
Demodex brevis living in a sebaceous gland eat adipose tissue of a sebaceous gland part.
Therefore the gland deteriorates, become inflamed and a pimple arises from the sebaceous gland. It may be one factor for rough skin.

11. Does a Demodex cause dermatosis?
If there are less than 15 Demodex mites in a 1cm x 1cm area of skin, there is not a problem generally. However, If there are more than 16 demodex mites in an area, the skin may become rough and pimples may appear. And if there are more than 40 demodex mites in an area. The possibility of serious dermatosis can be high. Without relation to the number of Demodex, skin is polluted by a corpse and excrement of the mites, strength of skin can become weak and it can become inflamed. If secondary infection occurs on the part which is inflamed by pyogenic bacteria, it may cause pustule acne or inflammation in a pore.


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