Details on the spread and occurrence of Demodex folliculorum mites among people­ have been re­searched exte­nsively. Recent studie­s reveal some note­worthy findings:

• Demodex folliculorum is a particular type of mite­. It mainly lives in hair follicles and oil glands of mammals. Scientists frequently detect the­se mites on human facial skin. Their numbers tend to increase in inflamed skin areas.
• The perce­ntage of people with De­modex mites differs across the­ globe. However, the­se mites have be­en found in nearly every age group and ethnicity.
• A study conducted in Chile’s harsh environment involved 680 participants aged 18-88 years. It uncovered a 13.5% pre­valence rate for De­modex mites. Demode­x folliculorum accounted for 89.1% of cases. The remaining 10.9% involved Demodex bre­vis.
• Environmental influences like­ sun exposure, ultraviolet rays, or pollution may impact these mites. Moreover, Demodex gene­tics linked to virulence and the eye or skin’s microbiome could affe­ct infestation severity and disease development.

• Kingdom: Animalia 
• Phylum: Arthropoda 
• Class: Arachnida 
• Order: Trombidiformes 
• Family: Demodecidae 
• Genus: Demodex 
• Species: Demodex folliculorum 
• A tiny arachnid, Demodex folliculorum, belongs to the Animalia kingdom and Arthropoda phylum. Its structure: diminutive adults span 0.3-0.4mm, almost microscopic. Long, cylindrical bodies taper towards the rear. Four stubby leg pairs cling near the body’s front end. A protective chitinous cuticle encases this mite. Specialized mouthparts feed on sebum, the skin’s oily secretion, extracting vital nutrients. These mites inhabit human hair follicles, concentrating on sebum-rich facial regions – the forehead, nose, and cheeks harbor thriving colonies.

• Demodex folliculorum has different strains or variants. These variants have distinct antigens on their surface. Some sources report at least two antigenic types: D. folliculorum type 1 (Df1) and D. folliculorum type 2 (Df2). Their morphology, distribution, and antibiotic susceptibility differ. For instance, Df1 is more prevalent on eyelashes and eyebrows, whereas Df2 is found more commonly on cheeks and forehead. Additionally, Df1 exhibits higher resistance to metronidazole, a drug frequently used to treat demodicosis, compared to Df2.

The Demodex folliculorum mite causes skin troubles, particularly facial ones. Key factors involved are:

• Imbalance of the eye’s surface microenvironment and tear film instability, potentially damaging the eye surface, causing inflammation and neurosensory disorders.
• Excess skin cells in hair follicles create facial scaliness. It may trigger an immune reaction exacerbating rosacea.
• Interaction between mites and the host’s skin microbiome, affecting skin barrier function and infection susceptibility.
• Demodex folliculorum is a type of mite with different stages in its life cycle. First, are the eggs. After hatching, larvae emerge. The larvae become protonymphs after molting. The next stage is nymph. Lastly, nymphs become adults. Females lay eggs inside glands in hair follicles. It takes 1-2 days for larvae to hatch from eggs. Larvae molt into protonymphs after 4-5 days. After 7-10 days, protonymphs become nymphs through molting. Nymphs mature into adults in 14-16 days. The adult mites mate near the skin surface, on hair follicle.

• The body has several defenses against Demodex folliculorum mites. The skin is a physical barrier that keeps the mites out. Sebum, a natural oil,
• lubricates and moisturizes the skin. It may also repel mites since they prefer areas with high sebum production.
• Our immune system fights invaders. It has molecules and cells that ide-ntify and remove fungi, viruses, bacteria, and parasites. It creates antibodies binding to mite surface antigens. These marks mites for destruction by immune cells.
• The microbiome makes skin healthy and works appropriately. Tiny living things like bacteria, fungi, viruses, and protozoa live on or inside our bodies. It gives nutrients, makes substances that fight germs, manages swelling, and keeps excellent and bad tiny life forms balanced. Research shows Demodex folliculorum works with the microbes on our skin. It affects how well the skin’s outer layer functions and whether we get infe-ctions quickly.

• Demodex folliculorum lives in hair follicles on human skin, especially the face. These mites often don’t cause issues. But sometimes, they lead to problems like dry, itchy, red, or scaly skin. People with rosacea, blepharitis, androgenetic alopecia, or facial dermatitis may get more mites.
• These mites usually don’t make anyone sick. However, sometimes they can irritate the skin and cause problems.

• A physician’s exam is required to identify Demodex folliculorum. They’ll extract a small sample from the affected region and study it microscopically; a procedure called a skin biopsy.
• The doctor will scrutinize this sample, seeking both mites and their eggs, confirming the presence of this condition.

You must clean your skin properly. Avoid things that boost mite growth. Here are some prevention tips:

• Daily, wash hair and eyelashes using a mild shampoo.
• Cleanse your face twice a day. Use a non-soap product.
• Avoid oil-based, greasy products. These clog pores with cells and oil.
• Weekly, gently scrub away dead cells from your skin.
• Try hard not to pick or massage your face excessively.

• Demodex Folliculorum: Symptoms, Causes, and Treatments (healthline.com)
• The Prevalence of Demodex folliculorum and Demodex brevis in Cylindrical Dandruff Patients (hindawi.com)