Blepharitis Management
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Direct answer
Blepharitis is chronic inflammation of the eyelid margins, divided anatomically into anterior blepharitis, affecting the lash zone and caused by staphylococcal infection or seborrhoea, and posterior blepharitis, which is meibomian gland dysfunction with obstructed, altered lipids and a deficient tear film. Patients complain of burning, grittiness, watering, red rimmed lids and crusting that is worse in the morning; signs include collarettes around lashes, madarosis, trichiasis, tylosis (thickened margins) and expressed turbid meibomian secretions. Because it is chronic rather than curable, management is a maintained routine — warm compresses and lid hygiene for life, topical antibiotic ointment for staphylococcal flares, and oral doxycycline or azithromycin for significant meibomian gland dysfunction.
What you must remember
- Anterior versus posterior: anterior blepharitis involves Zeis and Moll glands and follicles (staphylococcal or seborrhoeic); posterior blepharitis is meibomian gland dysfunction — the lid margin behind the grey line, with plugged orifices and foam in the tear lake.
- Staphylococcal signs to quote: hard collarettes around lash roots, madarosis (lash loss), trichiasis (misdirected lashes), tylosis, chronic conjunctivitis, marginal keratitis and phlyctenulosis in children.
- Meibomian gland dysfunction signs: thickened, injected posterior margin, capped or pouting orifices, turbid or toothpaste-like expressed secretion, foam along the lower lid, associated chalazia and evaporative dry eye.
- Lid hygiene is the backbone: warm compress 5-10 minutes to melt the blocked meibum, followed by lid margin scrubs (diluted baby shampoo or commercial lid wipes) twice daily, then reduced to once daily as maintenance.
- Pharmacotherapy: topical erythromycin or fusidic acid ointment to the margins at night for staphylococcal disease; oral doxycycline 100 mg daily (or azithromycin 500 mg for three consecutive days a month) for posterior blepharitis — avoid doxycycline in children under eight years and pregnancy; omega-3 supplementation is commonly advised as adjunct.
- Steroids have a narrow role: short mild topical steroid only for severe inflammation or marginal keratitis, never as long-term monotherapy.
- Look for the systemic company: seborrhoeic dermatitis, acne rosacea (flushing, telangiectasia, rhinophyma in men) and atopy travel with blepharitis — treating rosacea controls the eye.
- Complications: recurrent chalazion and hordeola, trichiasis with corneal abrasion, marginal keratitis, corneal vascularisation and scarring, and chronic irritative dry eye.
How to work through a refractory case
A 45-year-old shopkeeper attends for the fourth time in a year with "red eyes that no drop cures", burning worse on waking, crusted lids and a history of three chalazia. The examination writes the diagnosis: greasy lashes with collarettes anteriorly, thickened posterior margins with capped meibomian orifices, expressible turbid secretion and a tear break-up time under 8 seconds — anterior plus posterior blepharitis riding on unrecognized rosacea, with papular flushing across the cheeks. The plan is layered: demonstrate warm compress and scrub technique on the first visit, because technique fails more often than drugs; add fusidic acid ointment to the lash roots at night for two weeks for the staphylococcal load; start doxycycline 100 mg once daily for six to eight weeks, warning about photosensitivity and pill oesophagitis; treat the dry eye with preservative-free artificial tears; and address the rosacea itself, since the lid margin is effectively skin. Review at eight weeks with expressed meibomian secretions as the objective measure — the toothpaste-like plugging softens before symptoms fully settle. He is told plainly: this is controlled, not cured, and the maintenance scrub continues twice a week indefinitely.
Where students slip
The commonest mistake is labelling every symptomatic red margin "conjunctivitis" and prescribing repeated antibiotic drops, which neither touch meibomian obstruction nor the lid margin biofilm — the tip-off is symptoms worse in the morning with crusting, whereas conjunctivitis discharges all day. The second is misreading the drug: doxycycline here works as an anti-inflammatory and lipid-modifying agent at 100 mg daily (sometimes 40 mg modified-release), not as its antibacterial dose, and citing "antibiotic course for infection" in a viva loses marks. Finally, do not miss the child with staphylococcal blepharitis who develops a peripheral corneal infiltrate with a clear gap between it and the limbus — that is marginal keratitis, an immune reaction to staphylococcal antigens, treated with a short course of steroid with cover, not with intensifying antibiotics alone.
Frequently asked questions
How is anterior blepharitis distinguished from posterior blepharitis?
Anterior disease affects the lash-bearing margin anterior to the grey line (staphylococcal or seborrhoeic); posterior disease affects the meibomian glands behind the grey line, with plugged orifices and altered secretions.
Why is oral doxycycline used in meibomian gland dysfunction?
At low doses it inhibits bacterial lipases and matrix metalloproteinases, normalising meibomian lipid composition and reducing free fatty acid-driven irritation — an anti-inflammatory, not merely antibacterial, action.
What are collarettes and what do they indicate?
Whitish crusts ringing the lash bases, characteristic of staphylococcal anterior blepharitis; associated madarosis and trichiasis strengthen the staphylococcal label.
Which corneal complication follows staphylococcal blepharitis?
Marginal keratitis — a peripheral infiltrate separated from the limbus by a clear zone, an immune-mediated response to staphylococcal antigens, treated with short topical steroid plus lid therapy.
What is the first-line treatment any blepharitis patient must master?
Warm compresses followed by lid margin scrubs, done at least twice daily initially and continued long-term as maintenance; drug therapy supplements this routine, never replaces it.