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Demodex folliculorum
Demodex folliculorum is a microscopic mite that can survive only on the skin of humans. Most people host D. folliculorum on their skin particularly on the face, where sebaceous glands are most concentrated. Usually, the mites do not cause any harm, so are considered an example of commensalism rather than parasitism; but they can cause disease, known as demodicosis.
Due to being adapted to live inside hair follicles, D. folliculorum is thin and worm-like, with short legs. As an adult, D. folliculorum measures 0.3 to 0.4 mm (0.012 to 0.016 in) long. Adults have four pairs of legs; larvae and nymphs have only three pairs. D. folliculorum has a rudimentary gut but lacks an anus, so waste accumulates within the body until it dies.
The entire life cycle of D. folliculorum takes 14–16 days. Adult mites copulate at the top of the hair follicle, near the skin surface. Eggs are deposited in the sebaceous gland inside the hair follicle. The heart-shaped egg is 0.1 mm (0.0039 in) long, and hatches into a six-legged larva. In seven days the larva develops into a mature adult, with two intervening nymph stages. The adult lives for four to six days.
D. folliculorum prefers areas where sebum production is high, and is typically found in hair follicles on the human face, generally in greater numbers around the cheeks, nose, and forehead, but also elsewhere on the face, eyelids, and ears. The mites may also be found on other parts of the body, such as the chest and buttocks.
Within the hair follicle, D. folliculorum is found above the sebaceous gland, positioned head downward, with the end of the abdomen often protruding from the hair follicle. Inhabited follicles usually contain 2–6 mites, but numbers can be greater.
In one hour, D. folliculorum can travel 8 to 16 mm (0.31 to 0.63 in); they usually travel at night.
The mites are obligate commensals of humans, and can live only on the skin; they soon dry out and die if they leave the host. Higher numbers of D. folliculorum are found in the spring and summer than at other times of year.
D. folliculorum lives alongside other microorganisms on the skin and is part of the skin’s microbial community. Its presence may influence skin health and the balance of other microorganisms, sometimes contributing to skin conditions.
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Demodex folliculorum AI simulator
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Demodex folliculorum
Demodex folliculorum is a microscopic mite that can survive only on the skin of humans. Most people host D. folliculorum on their skin particularly on the face, where sebaceous glands are most concentrated. Usually, the mites do not cause any harm, so are considered an example of commensalism rather than parasitism; but they can cause disease, known as demodicosis.
Due to being adapted to live inside hair follicles, D. folliculorum is thin and worm-like, with short legs. As an adult, D. folliculorum measures 0.3 to 0.4 mm (0.012 to 0.016 in) long. Adults have four pairs of legs; larvae and nymphs have only three pairs. D. folliculorum has a rudimentary gut but lacks an anus, so waste accumulates within the body until it dies.
The entire life cycle of D. folliculorum takes 14–16 days. Adult mites copulate at the top of the hair follicle, near the skin surface. Eggs are deposited in the sebaceous gland inside the hair follicle. The heart-shaped egg is 0.1 mm (0.0039 in) long, and hatches into a six-legged larva. In seven days the larva develops into a mature adult, with two intervening nymph stages. The adult lives for four to six days.
D. folliculorum prefers areas where sebum production is high, and is typically found in hair follicles on the human face, generally in greater numbers around the cheeks, nose, and forehead, but also elsewhere on the face, eyelids, and ears. The mites may also be found on other parts of the body, such as the chest and buttocks.
Within the hair follicle, D. folliculorum is found above the sebaceous gland, positioned head downward, with the end of the abdomen often protruding from the hair follicle. Inhabited follicles usually contain 2–6 mites, but numbers can be greater.
In one hour, D. folliculorum can travel 8 to 16 mm (0.31 to 0.63 in); they usually travel at night.
The mites are obligate commensals of humans, and can live only on the skin; they soon dry out and die if they leave the host. Higher numbers of D. folliculorum are found in the spring and summer than at other times of year.
D. folliculorum lives alongside other microorganisms on the skin and is part of the skin’s microbial community. Its presence may influence skin health and the balance of other microorganisms, sometimes contributing to skin conditions.