So let’s reverse a bit. Demodex folliculorum and demodex brevis are popularly known as eyelash mites. Of the sixty-five species of demodex existing, they are the two species that live on the human body. Demodex infestation is a usual phenomenon and it usually has no symptoms.
Demodex folliculorum is normally located in the hair follicles, while demodex brevis exists in the sebaceous glands. These two species of demodex are found mostly on the face, eyebrows, eyelashes, and near the nose, but can also be found all over the body.
The female and male demodex mites have genital openings and fertilization is internal, so these species lay their eggs inside the sebaceous glands and hair follicles. They hatch very fast and develop into adults quite early too; within three to four days, the six-legged larvae hatch, and these larvae grow into adults in about seven days. The full lifetime of a demodex mite is only a couple of weeks.
Overgrowth of these mites is thought to be a major cause of blepharitis, rosacea and other cases related to corneal and conjunctival abnormalities. Dr Tseng's recognition of tea tree oil as a treatment for demodex eyelash mites is epic, because it works against these mites, eventually killing them. The amazing thing is that once the mites are gone, patients will often feel immediate relief.