Microscopic parasites naturally inhabit human skin, typically without causing harm. These tiny creatures, primarily residing in hair follicles and oil glands, can sometimes proliferate excessively, leading to a rare condition called demodicosis. This article delves into the types of burrowing hair parasites, their symptoms, diagnosis, and available treatment options.
Demodex mites are microscopic parasites that naturally live on your skin, and they're usually harmless. They're mainly in your hair follicles and the oil glands on your face, neck, or chest. These arachnids, cousins of spiders and ticks, are present in almost every person's skin and pores. They are microscopic and you can't see or feel them. Usually, they cause no issues and need no treatment. However, when the immune system is weakened or other skin conditions exist, they can multiply rapidly, leading to demodicosis, a condition characterized by itching and irritation.
Demodex mites lay eggs inside hair follicles and oil glands. Larvae hatch within three to four days and reach adulthood after seven days. The mites live for about two weeks. They usually come out at night to feast on dead skin cells before retreating to their hiding spots to lay eggs. When they die, they break down inside your hair follicles and sebaceous glands.
Demodex mites can spread from person to person by contact with hair, eyebrows, or oil glands on your skin.
Two types of Demodex mites live on humans: Demodex folliculorum (D. folliculorum) and Demodex brevis (D. brevis).
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D. folliculorum mites are around 0.3-0.4 millimeters long. This is the most common type of demodex mite. They tend to stay in the facial area, including your nose, cheeks, chin, eyelashes, eyebrows, and scalp. They might also be found on your neck and ears. They like to get inside the upper part of a hair follicle and survive on skin cells and oil.
D. brevis mites are slightly smaller at 0.15-0.2 millimeters. While D. brevis mites aren't as common as D. folliculorum, they affect a larger area of your body. They can affect your face and eyes but tend to migrate to your chest and neck area. They prefer to go deep into the oil glands and feed on the cells.
Both types have elongated, semi-transparent bodies made up of two fused segments, one of which has eight legs attached. Scales cover their bodies, helping them attach to your hair follicles. They have mouthparts designed to consume skin cells, oil, and hormones in your hair follicles and oil glands.
Small numbers of Demodex mites can be good for you because they remove dead skin cells and extra oil on your skin. As long as the amount of mites on your skin stays under control, you are unlikely to have any problems. But sometimes, people end up with too many mites burrowing into their skin, leading to demodicosis - the infection that causes skin inflammation. People between the ages of 20 and 30 may be more prone to demodicosis, as can older people and children under 5. You may also be prone to this rare condition if you're on immunosuppressive drugs or have an immune-related disease, such as HIV/AIDS or liver disease.
Some common symptoms of D. folliculorum infection are:
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If your eyes are affected, you could notice:
D. brevis symptoms are similar to those of D. folliculorum. But unlike with D. folliculorum, you may notice them on your neck or chest area. Large infestations of the mites may lead to symptoms such as:red, scaly skina rough texture to the skin, like sandpapera burning sensation in the skin
Some common conditions that have been linked to infestations of Demodex mites include:
You can't tell you have D. folliculorum unless you have symptoms. To diagnose it, your doctor will scrape your skin to get a sample and look at it under a microscope.Your doctor diagnoses D. brevis the same way they do D. folliculorum - by looking at your skin cells under a microscope. A doctor can diagnose demodicosis with a biopsy. This involves taking a small skin sample and checking it under a microscope. The doctor will also ask about symptoms and look for other signs of the mites, such as scaly skin. Demodicosis will be diagnosed if there is a high level of mites in the follicles in addition to skin symptoms.
If the mites are on your eyelids, your doctor may prescribe a topical eye drop called lotilaner (Xdemvy). The FDA-approved drops are taken twice a day for six weeks. They work by targeting the mites and killing them. The most commonly used treatment for demodicosis is a medication you apply to your skin called metronidazole. Other treatments include:
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In severe cases of mites, or for people with weakened immune systems, a doctor may recommend oral ivermectin. It is also important to manage any underlying conditions, such as immunosuppressing conditions like HIV, that may be contributing to high levels of mites.
If your doctor thinks mites caused your blepharitis, they'll advise cleaning your eye area daily with warm water. Warm compresses can help relieve swelling while they clean your lashes and eyelids. Your doctor may exfoliate your eyelids (remove dead skin from them) to provide relief. Medicated ointments can also help prevent the spread of Demodex mites from your eyelashes. Some people use tea tree oil as a home remedy for Demodex, but researchers aren't sure how well it works. One study found it draws the mites out of your skin, which could make it easier for treatments to work. But tea tree oil can irritate your eyes. If you want to reduce the number of mites you have, even if you don't have symptoms of an infection, these steps may help:
While Demodex mites are common, other insects and conditions can cause scalp itching and irritation.
A head lice infestation is one of the most common reasons for an itching sensation on your scalp. These small parasites can be white, brown, or black. They don’t have wings and move by crawling. You’ll typically find them at the base of hair shafts, especially around your neck and ears. You may also notice small, oval eggs (nits) on hair strands near your scalp. You can see lice with your naked eye, but they’re often easier to spot when you have wet hair. You can also use a magnifying glass to find them more easily.
Like lice, fleas are small and wingless parasites. Flea bites itch, and they may leave discolored welts, blisters, or bumps. Fleas are brown or black, and you can see them with your naked eye. However, they move much more quickly than lice and other bugs, and they can hop and crawl. They usually don’t make their home in human hair - your pet’s hair is another story entirely. Fleas also don’t lay eggs in human hair. If your pet has fleas, you may be more likely to have fleas on your body, but they often don’t survive for long. You can also kill fleas on your body by taking a hot shower with plenty of soap.
It’s uncommon for ants to infest your hair, but it’s still possible. Pheidole ants (barber ants) can cause a rare condition called ant-induced alopecia. To put it simply, they may eat your hair, causing patches of hair loss on your scalp. These wingless ants are reddish or yellowish brown. You can see them with your naked eye, and they resemble other types of ants. If you have ants in your hair, you may feel a crawling sensation on your scalp, but you won’t experience the intense itch that you would with lice and flea bites. Consider contacting a doctor right away if you believe you have ants in your hair.
Bedbugs are small, flat, reddish brown bugs that you can see with your naked eye. They have wing pads, which resemble wings but aren’t fully functional. They usually don’t hang out in your hair or on your scalp. They actually prefer furniture and mattresses. If they do somehow end up in your hair, they won’t survive for long. They’re not equipped to attach to human hair, and they also don’t like light or heat. If you suspect you have bedbugs in your hair, you can often wash them out in a hot shower.
This scalp condition causes your skin to flake, and those white flakes may resemble head lice or nits at first glance. Key differences between dandruff and lice include:
Scalp psoriasis is a skin condition that may cause an itching sensation. But the similarities between lice and psoriasis stop there. Psoriasis causes thick, crusted scales that build up on your skin. If you notice these scales, it’s best to contact a dermatologist who can diagnose psoriasis and recommend helpful treatments.
If you feel like something is crawling on or beneath your skin, but there’s nothing there, you may be experiencing a tactile hallucination called formication. If you can’t find any bugs or flakes on your scalp but continue to feel an itching sensation, consider reaching out to a doctor for more guidance.
If you think you may have bugs in your hair, these tips can help:
Epidermal parasitic skin diseases (EPSD) are common in the tropics and sub-tropics. They are caused by mites, lice and other blood-sucking insects. In resource-poor countries they are associated with considerable morbidity. Hitherto, EPSD are treated with insecticides with a neurotoxic mode of action.
A new concept for treating EPSD is presented which is based on the topical application of dimeticones, silicone oils of low viscosity which rapidly kill insects and mites by a physical mode of action. They creep into the respiratory system and block oxygen supply. The physical mode of action makes the development of resistant parasite strains very unlikely.
In resource-poor settings cutaneous larva migrans, scabies, pediculosis capitis and tungiasis are the most common EPSD. In population groups in which these diseases prevail, polyparasitism is frequent and particularly children are simultaneously infested with two, three or even four different ectoparasites. The reason is that the different EPSD share similar risk factors such as lack of sanitation, crowding, precarious housing conditions, low level of education, etc.
Currently available treatments have several constraints: For instance, the insecticides commonly used are potentially toxic, resistance is spreading and repeated applications are necessary; ivermectin is contra-indicated in children < 5 years and pregnant women and, hence, cannot be used for mass treatment. Obviously, a new treatment concept is needed.
As a rule, scabies prevails were poverty exists. In resource-poor settings the prevalence ranges between 4 and 80%. Humans are the only host of Sarcoptes scabiei. Transmission is predominantly from person-to-person and only rarely through fomites. Children and women are the most vulnerable population groups, since in endemic areas frequent body contacts occur between and within these groups. In a minority of the patients, the intensity of infestation is extremely high and parasites are spread all over the body (disseminated or Norwegian scabies). Bacterial superinfection of lesions is common and, if caused by group A streptcococci, may cause post-streptococcal glomerulonephritis or rheumatic heart disease. The predominant symptom is itching.
Head lice are very specific parasites. They can only propagate on human scalp. In the children population, pediculosis capitis is heterogeneously distributed with spatiotemporal clusters. Head lice infestation is usually considered to be a nuisance, not a disease. Similar to scabies, head lice lesions are very itching and cause the patient to scratch its scalp. Repeated scratching leads to excoriations which facilitate bacterial superinfection. Pathogens, such as Staphylococcus aureus and streptococci are passively transported by head lice when they move from an infected lesion to other parts of the scalp. Head lice can also transmit important pathogens actively. Eggs are attached to the hair at certain predilection sites. Resistance against pediculocides with a neurotoxic mode of action such as permethrin and malathion occurs worldwide and is spreading. Cross-resistance and double-resistance are common.
Tungiasis (sand flea disease) is caused by the penetration of female sand fleas (Tunga penetrans) into the skin. Sand flea disease is a zoonosis affecting a broad spectrum of domestic and sylvatic animals with dogs, cats, pigs, cows and rats as typical reservoirs. Tungiasis is a disease of the poorest of the poor. It thrives in the underdeveloped rural hinterland, in isolated communities along the sea shore, in the periphery of rural towns and in the slums of big cities in South America, The Caribbean and sub-Saharan Africa. The prevalence of tungiasis in people living in resource-poor rural and urban communities may be up to 60%. Frequently, lesions occur in clusters at certain predilection sites with up to 30 embedded sand fleas aggregated in a small area accompanied by inflammation and necrosis of the surrounding tissues. Repeated infections and the unavailability of an appropriate treatment cause a persistent inflammation of the feet. If the lesions are located at the sole, deep fissures and ulcers develop. Chronic sand flea disease is debilitating and disabling, and eventually causes mutilation of the feet. This results in difficulty in walking and restricted mobility. In an act of desperation, affected individuals try to get rid of the parasites by using sharp instruments such as safety pins, needles, scissors, a knife, a thorn or a sharply pointed piece of wood. The instruments are not disinfected and are subsequently used in several household members. They are also shared between neighbors. Bacterial superinfection is an almost constant finding and may consist of an array of aerobe, micro-aerophilic and anaerobe bacteria including clostridia.
A paradigm shift is needed for the treatment of EPSD. Rather than killing ectoparasites through a potentially toxic chemical compound and only active against a single species, a drug is needed which targets an Achilles heel present in all ectoparasites. The respiratory tract seems to be such a target. For instance, in lice 14 narrow openings let oxygen enter and guarantee oxygen supply of vital organs. If these openings are blocked, lice will rapidly die from suffocation. However, the openings have a diameter of ≤ 10 μm, preventing liquids with a normal surface tension to enter. With 2 μm diameter the respiratory openings in the lid of lice eggs are even smaller. Scabies mites breathe through very small pores distributed over the body. Sand fleas are almost totally embedded in the epidermis, but remain in contact with the environment through an opening in the skin of about 200 μm. The intestinal, the genital and the respiratory tract jointly enter in the so-called abdominal cone through which eggs are expelled, faeces is excreted and oxygen enters trachea-like structures. Obviously, only compounds with a very low viscosity can creep into such small openings, fill the respiratory tract and, thereby, prevent diffusion of oxygen. Polydimethylsiloxanes (dimeticones) are such compounds. Dimeticones are chemically inert, non-toxic and have a pure physical mode of action. It has been shown that a mixture of two dimeticones (one with an extremely low and the other with a moderate viscosity) kill head lice in vitro within a couple of minutes. The efficacy of this approach was demonstrated in a randomized clinical trial in Brazilian children with a high intensity of infestation. The new treatment concept was subsequently tested in tungiasis. In a field study in rural Kenya, the feet of 47 children were randomized to either receive the treatment recommended by the Ministry of Health (bathing the whole foot in a 0.05% solution of KMnO4) or a topical application of dimeticone. In the dimeticone group 78% of sand fleas lost all viability signs within seven days and 92% of the parasites developed in an abnormal way. Dimeticones are a family of compounds with a physical mode of action, targeting an Achilles heel of ectoparasites. Development of resistance is very unlikely.
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