## First-Line Treatment of Erosive Oral Lichen Planus **Key Point:** Topical corticosteroids (specifically triamcinolone acetonide) are the first-line treatment for erosive oral lichen planus due to their anti-inflammatory potency and direct local delivery to affected mucosa. ### Rationale for Triamcinolone Acetonide **High-Yield:** Triamcinolone acetonide 0.1% paste or 0.1% oral rinse is preferred for oral lichen planus because: - High potency (Class III–IV) allows effective mucosal penetration - Applied directly to erosive lesions for rapid symptom relief - Minimal systemic absorption when used as paste - Faster onset than systemic agents ### Treatment Hierarchy for Oral LP | Severity | First-Line | Second-Line | Third-Line | |----------|-----------|------------|------------| | Non-erosive | Topical corticosteroid | Topical calcineurin inhibitor | Systemic corticosteroid | | Erosive/severe | Topical corticosteroid (high potency) | Topical tacrolimus + corticosteroid | Systemic corticosteroid ± methotrexate | ### Why Triamcinolone Over Alternatives **Clinical Pearl:** Topical tacrolimus (option A) is reserved for **steroid-refractory** cases or when long-term use is needed (to avoid atrophy); it is not first-line. **Warning:** Systemic methotrexate (option C) and acitretin (option D) are reserved for **generalized cutaneous lichen planus** with significant mucocutaneous involvement or when topical therapy fails — not for isolated erosive oral disease. ### Application Strategy 1. Apply triamcinolone 0.1% paste directly to erosions 3–4 times daily 2. Rinse mouth gently; do not swallow 3. Review in 2 weeks; taper if healing occurs 4. If inadequate response after 4 weeks → add topical tacrolimus or consider systemic corticosteroid [cite:Inamadar & Palit, IADVL Textbook of Dermatology 5e]
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