What causes white membranes on the eyelid (palpebral conjunctiva)?

White Eyelid Membranes: Causes and Clinical Approach

White membranes on the palpebral conjunctiva (eyelid lining) are most commonly caused by pseudomembrane or true membrane formation from severe inflammatory conjunctivitis, with the most critical diagnosis being ligneous conjunctivitis due to plasminogen deficiency, which requires immediate recognition to prevent vision-threatening complications.

Primary Causes of White Eyelid Membranes

Ligneous Conjunctivitis (Most Important to Recognize)

This is the diagnosis you cannot miss because it causes thick, firm, woody white-to-yellowish pseudomembranes on the palpebral conjunctiva and can lead to blindness if untreated 1.

• Pathophysiology: Systemic plasminogen deficiency (inherited autosomal recessive, PLG gene mutation) 1, 2
• Clinical presentation:
  • Bilateral in 50% of cases
  • Chronic, recurrent conjunctivitis with mucoid discharge
  • Thick, firm/woody pseudomembranous structures on upper and/or lower eyelid conjunctiva
  • Triggered by local infection or injury 1
• Critical complications: Corneal scarring, neovascularization, perforation, amblyopia, vision loss, and can be life-threatening if respiratory tract involved 1
• Diagnosis confirmation: Check plasminogen levels (will be severely deficient, <2%) 2

Severe Infectious Conjunctivitis with Membrane Formation

Bacterial causes producing white membranes:

• Chlamydial conjunctivitis (serotypes D-K in adults, causing chronic inflammation with cicatricial changes) 1
• Trachoma (C. trachomatis serotypes A, B, C - leading infectious cause of global blindness with conjunctival scarring) 1
• Parinaud oculoglandular syndrome (Bartonella henselae, Francisella tularensis) with granulomatous follicular conjunctivitis 1

Drug-Induced Membranous Conjunctivitis

Stevens-Johnson syndrome or toxic epidermal necrolysis can cause necrotizing pseudomembranous conjunctivitis with densely adherent true membranes 3. Sulfasalazine and other medications are known triggers.

Foreign Body-Related Pseudomembranes

Retained conjunctival foreign bodies can trigger pseudomembrane formation requiring repeated removal 4.

Distinguishing Pseudomembranes from True Membranes

Pseudomembranes (more common):

• Composed of fibrin, tenascin, fibronectin with polymorphonuclear leukocytes 3
• Can be removed without bleeding
• Seen in ligneous conjunctivitis, viral infections, foreign bodies

True membranes:

• Incorporate deeper conjunctival tissue
• Bleed when removed
• Seen in severe Stevens-Johnson syndrome, diphtheria 3

Clinical Algorithm for Evaluation

Immediate assessment priorities:

1. Laterality and chronicity: Bilateral chronic = think ligneous conjunctivitis first

2. Membrane characteristics: Thick, woody, yellowish-white = ligneous conjunctivitis 1, 2

3. Associated findings:

   • Preauricular lymphadenopathy = infectious (Parinaud syndrome, trachoma) 1
   • Systemic symptoms/skin lesions = Stevens-Johnson syndrome 3
   • History of trauma/foreign body = mechanical cause 4

4. Laboratory workup:

   • Plasminogen level (essential if ligneous conjunctivitis suspected) 2
   • Conjunctival cultures/PCR for Chlamydia if infectious suspected 1
   • Biopsy if diagnosis unclear 2, 3

Critical Pitfalls to Avoid

• Do not assume all white membranes are infectious - ligneous conjunctivitis is non-infectious and requires completely different management 1, 2
• Do not delay plasminogen testing in chronic bilateral cases with woody membranes - this can prevent catastrophic outcomes 1
• Surgical debridement of membranes removes inflammatory debris that promotes infection and scarring, but must be combined with appropriate medical therapy 3
• Repeated membrane removal may be necessary in ligneous conjunctivitis and foreign body cases 2, 4