This site provides general eye-health education. It cannot replace individual assessment by a registered doctor, and does not offer personal diagnosis, prescriptions, bookings, sales or referrals.
If translations differ or are incomplete, the Traditional Chinese (zh-Hant) text on this site prevails.
Eyelids and tear film · G
Demodex-related blepharitis
Cylindrical dandruff
Last reviewed: 2026-10-06 · 潘家健醫生
Key points
Demodex can live in lash follicles and meibomian glands; collarettes are a commonly mentioned sign — excess is a clinical decision.
The life cycle is about two weeks, so courses often last weeks — this page does not pitch mite products.
Home care is non-drug education; medicines need Hong Kong registration and clinician guidance.
This cannot replace a visit; worse red pain or vision change needs care.
Demodex on lashes can drive chronic blepharitis. Cylindrical dandruff at the lash roots is a clue. Treatment classes a doctor may discuss include lid hygiene and, where appropriate, prescription agents. This page does not name consumer brands as a shopfront.
This is general medical information, not a diagnosis, and cannot replace an in-person consultation with a registered ophthalmologist, refraction, or a dilated fundus exam. It is not advice to use any medicine or undergo any procedure. Medicines (including off-label use), laser or surgery must be decided by a registered doctor after examination, according to indications and Hong Kong registration. Figures from the literature are published averages, not any clinic’s results. This site does not book, prescribe or refer. Do not change treatment on your own.
