Follicle mite

Definition

Any mite in the family Demodecidae, especially the genus Demodex, that lives commensally or parasitically within hair follicles and sebaceous glands of mammals. These elongate, worm-like mites possess reduced segmentation and short legs adapted for gripping within follicular tissue; they feed on sebum and epithelial cells. Human-associated species (Demodex folliculorum, D. brevis) are nearly universal in adults and typically asymptomatic, though overpopulation may contribute to dermatological conditions such as rosacea or blepharitis.

Etymology

From Latin folliculus (small bag, diminutive of follis), referring to the hair follicle; mite from Old English mīte, a small arachnid.

Example

Demodex folliculorum, the human follicle mite, resides in hair follicles of the face and eyelashes, emerging at night to move between follicles and mate.

Synonyms

• Demodecid mite
• follicular mite
• face mite
• eyelash mite

Related Terms

• Demodex
• Demodecidae
• sebaceous gland
• commensalism
• blepharitis
• rosacea
• acarology
• hair follicle

Usage Notes

Technically refers to family Demodecidae, though often used specifically for human-associated Demodex species. Not to be confused with scabies mites (Sarcoptidae) or other follicle-inhabiting mites such as certain Cheyletiella species. The term 'follicle mite' emphasizes habitat over taxonomy; 'Demodecid mite' is more precise for taxonomic reference. Infestation is usually called 'demodicosis' when pathological.