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ophtho.blepharitis-stye-chalazion.core.v1

Blepharitis, hordeolum (stye), and chalazion

general_internal_medicinesubacutechronicadultpediatricgeriatricoutpatient
Start encounter →Print handoutPRODUCTION

Combined outpatient bundle for blepharitis (anterior bacterial / posterior MGD / Demodex), hordeolum (stye), and chalazion. Foundation shared: warm compress + lid hygiene + omega-3. Subtype-specific therapy: anterior bacterial → topical erythromycin (RxCUI 374382) or bacitracin ophthalmic ointment (RxCUI 1155666); refractory MGD / ocular rosacea → oral doxycycline (RxCUI 3640); Demodex → lotilaner 0.25% (RxCUI 1998841) BID x6 wk per SATURN-1 (PMID 35965392) / SATURN-2 (PMID 37285925) / pooled (PMID 39873946); refractory chalazion → intralesional triamcinolone (RxCUI 10761) or transconjunctival I&C; stye → warm compress + selective topical antibiotic / I&D. Guidelines reconciled 2026-05-26 against AAO Preferred Practice Pattern Blepharitis 2023 cycle. SATURN-1 (PMID 35965392), SATURN-2 (PMID 37285925), and pooled SATURN-1/-2 (PMID 39873946) all re-verified live via PubMed MCP this session; titles, journals, years, and effect sizes match. RxCUIs verified live against RxNav 2026-05-26 (forward name->cui + reverse cui->RxNorm Name): erythromycin ointment 374382, bacitracin ophthalmic 1155666, doxycycline 3640, lotilaner 1998841, triamcinolone acetonide 10761. Incision-and-curettage and in-office MGD procedures encoded as non-pharm. Safety guardrails: (a) recurrent same-site chalazion in older adult MUST be biopsied to exclude sebaceous carcinoma — the great lid-lesion masquerader; (b) lid swelling with proptosis / motility restriction / pain on eye movement / decreased vision / fever = orbital cellulitis, routed OUT same-day to ophtho.orbital-cellulitis.core.v1; (c) preseptal cellulitis routed to ophtho.preseptal-cellulitis.core.v1; (d) doxycycline contraindicated in pregnancy / breastfeeding / under age 8 (dental staining + teratogenicity); (e) intralesional triamcinolone risks skin hypopigmentation + atrophy especially in darker Fitzpatrick types — consider I&C preferentially; (f) never squeeze a pointing stye. All encoded in severity_triggers and contraindication_rules. Effect sizes (anchored): SATURN-1 (PMID 35965392) collarette grade 0 cure 44.0% vs 7.4% vehicle (P<0.0001); mite eradication 67.9% vs 17.6% (P<0.0001); composite cure 13.9% vs 1.0%. SATURN-2 (PMID 37285925) collarette grade 0 cure 56.0% vs 12.5% (P<0.0001); composite cure 19.2% vs 4.0%. Pooled SATURN-1/-2 (PMID 39873946) n=833: collarette grade 0 49.8% vs 9.9% (P<0.0001); mite eradication 60.2% vs 16.1% (P<0.0001); erythema cure 24.9% vs 7.9%; 92% drop comfort.

Entry points (5)

  • symptom
    Chronic lid-margin crusting / scurf / burning / itching with foamy tears or red lid margins — anterior + posterior blepharitis (AAO PPP Blepharitis 2023)
    chronic_lid_margin_crusting_irritation
  • symptom
    Cylindrical waxy collarettes encircling the lash base on slit-lamp — diagnostic for Demodex blepharitis (SATURN-1 PMID 35965392; SATURN-2 PMID 37285925)
    cylindrical_collarettes_at_lash_base
  • symptom
    Acutely tender, red, focal lid swelling with pointing pustule — external (gland-of-Zeis) or internal (meibomian-gland) hordeolum / stye
    tender_red_lid_bump_acute
  • symptom
    Painless firm nodular lid lump persisting beyond acute phase — chalazion (sterile lipogranulomatous meibomian-gland obstruction)
    painless_lid_nodule_chronic
  • symptom
    Recurrent same-site chalazion in an older adult — BIOPSY to exclude sebaceous carcinoma (great masquerader)
    recurrent_same_site_chalazion_older_adult

Required inputs (11)

  • lid_margin_examination_signsrequired
    symptom • used at INITIAL_WORKUP
    Slit-lamp inspection of lid margin (anterior vs posterior signs; cylindrical collarettes; lid-margin telangiectasia; orifice plugging) drives subtype assignment (AAO PPP Blepharitis 2023; SATURN-1 PMID 35965392)
  • meibomian_gland_expression
    symptom • used at INITIAL_WORKUP
    Meibomian gland expression yields normal clear oil vs turbid/granular/inspissated material — quantifies MGD severity and drives in-office procedure decisions (AAO PPP Blepharitis 2023)
  • demodex_collarette_grading
    symptom • used at CONTEXT
    Collarette grade (0/1/>1) per SATURN scale guides lotilaner candidacy and post-treatment monitoring (SATURN-1 PMID 35965392; SATURN-2 PMID 37285925)
  • lesion_morphology_pointing_acute_or_chronicrequired
    symptom • used at ENTRY
    Tender + red + pointing pustule = stye (acute); painless + firm nodule = chalazion (chronic); both warrant warm compress foundation (AAO PPP Blepharitis 2023)
  • recurrent_or_atypical_lid_lesion_featuresrequired
    symptom • used at RED_FLAGS
    Recurrent same-site lesion, madarosis, distorted lid architecture, ulceration, induration → biopsy to exclude sebaceous / basal-cell / squamous-cell carcinoma (AAO PPP Blepharitis 2023)
  • orbital_extension_proptosis_motility_painrequired
    symptom • used at RED_FLAGS
    Proptosis + pain with eye movement + ophthalmoplegia + decreased vision → orbital cellulitis (post-septal infection) — route OUT to ophtho.orbital-cellulitis.core.v1 emergently
  • rosacea_seborrheic_dermatitis_atopyrequired
    history • used at CONTEXT
    Ocular rosacea, seborrhoeic dermatitis, and atopic disease drive chronic blepharitis; co-manage skin disease via derm engines (AAO PPP Blepharitis 2023)
  • contact_lens_use_or_makeup
    history • used at CONTEXT
    Contact-lens wear, eyelash extensions, mascara residue exacerbate lid-margin disease; counsel pause / replacement (AAO PPP Blepharitis 2023)
  • dry_eye_disease_comorbidityrequired
    history • used at CONTEXT
    Blepharitis-MGD is the dominant driver of evaporative DED; co-engage ophtho.dry-eye-disease.core.v1 (TFOS DEWS II)
  • pregnancy_or_breastfeeding_for_oral_doxycycline
    history • used at TREATMENT
    Doxycycline contraindicated in pregnancy / under age 8 — gates the anti-inflammatory adjunct (AAO PPP Blepharitis 2023)
  • darker_skin_for_intralesional_steroid_caution
    history • used at TREATMENT
    Intralesional triamcinolone risks skin hypopigmentation + atrophy more visibly in darker Fitzpatrick skin types — counsel and consider incision-and-curettage preferentially (AAO PPP Blepharitis 2023)

12-phase flow (12)

  1. 1FRAME
    Frame as a three-disorder common-outpatient bundle (blepharitis / stye / chalazion) sharing the warm-compress + lid-hygiene foundation but diverging in specific therapy: anterior bacterial → topical antibiotic; Demodex → lotilaner; chronic chalazion → intralesional steroid or I&C; stye → conservative + topical antibiotic if blepharitis present. The over-arching guardrail is sebaceous-carcinoma masquerade in recurrent same-site chalazia and the orbital-cellulitis route-out (AAO PPP Blepharitis 2023).
    advance: bundle frame + masquerade and orbital-cellulitis route-out noted
  2. 2ENTRY
    Three entry phenotypes: (1) chronic lid-margin crusting/burning → blepharitis; (2) acute tender focal lid swelling pointing pustule → stye; (3) painless firm chronic lid nodule → chalazion. Recurrent same-site chalazion in older adult → biopsy for sebaceous carcinoma.
    inputs: lesion_morphology_pointing_acute_or_chronic
    advance: entry phenotype assigned
  3. 3CONTEXT
    Build context: ocular rosacea + seborrhoeic dermatitis + atopy drive chronic blepharitis; contact-lens + eyelash extensions + mascara residue exacerbate; concurrent dry-eye disease must be co-managed; Demodex collarette grading on slit-lamp (SATURN-1 PMID 35965392).
    inputs: rosacea_seborrheic_dermatitis_atopy, dry_eye_disease_comorbidity, demodex_collarette_grading
    advance: underlying drivers + Demodex grade documented
  4. 4RED_FLAGS
    Screen sebaceous carcinoma (recurrent same-site chalazion + madarosis + distorted lid architecture + induration → biopsy threshold low). Screen orbital cellulitis (proptosis + motility restriction + pain on eye movement + decreased vision + fever) — route OUT same-day to ophtho.orbital-cellulitis.core.v1. Preseptal cellulitis with lid swelling alone routes to ophtho.preseptal-cellulitis.core.v1.
    inputs: recurrent_or_atypical_lid_lesion_features, orbital_extension_proptosis_motility_pain
    advance: masquerade biopsy decision documented; orbital extension routed if present
  5. 5INITIAL_WORKUP
    Slit-lamp lid-margin examination: anterior signs (lash collarettes, lash loss, scurf), posterior signs (telangiectasia, orifice plugging, foamy tears, expressible meibum quality). Look specifically for cylindrical collarettes at lash base (Demodex pathognomonic per SATURN). For stye/chalazion: location (upper vs lower lid), single vs multiple, associated blepharitis (AAO PPP Blepharitis 2023; SATURN PMID 35965392).
    inputs: lid_margin_examination_signs, meibomian_gland_expression
    advance: subtype + Demodex status + associated MGD documented
  6. 6BRANCHING_WORKUP
    Subtype-specific decision: anterior bacterial → topical antibiotic; Demodex collarettes → lotilaner; posterior MGD → warm compress + omega-3 + topical anti-inflammatory; chronic chalazion → conservative then intralesional steroid or I&C; recurrent atypical → biopsy. Co-engage dry-eye engine for MGD-driven evaporative DED.
    advance: subtype-specific plan set
  7. 7DIFFERENTIAL
    Terminal differential: anterior blepharitis (Staphylococcal vs seborrhoeic) vs posterior MGD vs Demodex blepharitis (collarettes pivot) vs hordeolum/stye (acute tender) vs chalazion (chronic painless) vs sebaceous carcinoma (recurrent + atypical → biopsy) vs basal-cell / squamous-cell lid carcinoma vs preseptal/orbital cellulitis (route OUT) vs pyogenic granuloma (post-chalazion incision) vs trichiasis-driven mechanical irritation (AAO PPP Blepharitis 2023).
    advance: single best diagnosis assigned; masquerades excluded
  8. 8RISK_STRATIFICATION
    Severity by chronicity, response to warm compress + lid hygiene, presence of corneal involvement (marginal infiltrates, phlyctenule), and impact on quality of life. Refractory disease + ocular-surface compromise warrants escalation. Sebaceous-carcinoma risk: older age + recurrent same-site + atypical features = biopsy threshold low.
    advance: severity tier + biopsy threshold set
  9. 9TREATMENT
    (A) FOUNDATION (all three): warm compress 5-10 min q.i.d. + gentle lid massage + commercial lid scrub (or dilute baby shampoo) + omega-3 (for MGD). (B) ANTERIOR BACTERIAL BLEPHARITIS: topical erythromycin or bacitracin ophthalmic ointment to lid margin q.h.s. x1-2 wk; refractory → oral doxycycline 50-100 mg BID x2-12 wk (anti-lipase + anti-inflammatory). (C) DEMODEX BLEPHARITIS: lotilaner 0.25% ophthalmic BID x6 wk per SATURN-1 (PMID 35965392) and SATURN-2 (PMID 37285925) — pooled (PMID 39873946) collarette grade 0 49.8% vs 9.9% vehicle. (D) STYE: warm compress; topical antibiotic if blepharitis present; I&C if persistent + pointing. (E) CHALAZION: warm compress 4-6 wk; refractory → intralesional triamcinolone 0.1-0.2 mL of 40 mg/mL OR transconjunctival I&C under local anaesthesia. Doxycycline contraindicated in pregnancy + under age 8 (AAO PPP Blepharitis 2023).
    inputs: pregnancy_or_breastfeeding_for_oral_doxycycline, darker_skin_for_intralesional_steroid_caution
    advance: subtype-specific therapy started; foundation laid; co-manage DED
  10. 10DISPOSITION
    Almost entirely outpatient. Same-day specialist referral for: suspected orbital cellulitis → ophtho.orbital-cellulitis.core.v1; suspected sebaceous / SCC / BCC lid carcinoma → oculoplastics for biopsy. Chronic refractory blepharitis with corneal involvement → cornea referral (AAO PPP Blepharitis 2023).
    advance: disposition + referral pathway documented
  11. 11MONITORING
    Re-examine at 4-6 weeks per intervention: blepharitis on topical antibiotic / lotilaner / doxycycline; chalazion conservatively (often resolves spontaneously by 6 wk); after intralesional steroid (re-injection at 4-6 wk if persistent). Adherence audit and lid-hygiene technique check every visit (AAO PPP Blepharitis 2023).
    advance: response assessment + adherence audit running
  12. 12FOLLOWUP
    Chronic-disease maintenance for blepharitis-MGD: lifelong lid hygiene + warm compress + omega-3; episodic flare control. Counsel patients that blepharitis is a chronic condition; reinforce daily routine. Co-manage rosacea / atopic / seborrhoeic skin disease via derm engines. Co-manage evaporative DED via ophtho.dry-eye-disease.core.v1. Repeat biopsy threshold for any recurrent atypical lesion (AAO PPP Blepharitis 2023).
    advance: chronic-disease maintenance plan + co-management documented