Treatment of Canker Sores (Aphthous Ulcers)
For uncomplicated canker sores, topical corticosteroids are the first-line treatment, with topical hyaluronic acid-based gels serving as an effective alternative that promotes healing within the first week while avoiding steroid side effects 1.
Treatment Algorithm
For Simple, Uncomplicated Canker Sores
First-Line Options:
- Topical corticosteroids remain the gold standard based on extensive clinical experience 1
- Hyaluronic acid-based adhesive gels (such as medical device formulations) applied daily for 14 days show significant reduction in both lesion number and size within 3-6 days, with excellent safety profiles and no systemic side effects 2
Alternative Topical Agents:
- Placental extract gel demonstrates effectiveness in reducing pain and ulcer size with notably lower recurrence rates compared to other topical treatments 3
- Curcumin gel also reduces pain and ulcer size effectively, though it has higher recurrence rates and 40% of patients report unpleasant taste 3
When to Escalate Care
Consider biopsy and systemic workup if:
- Ulcers persist beyond 2 weeks
- No response to 1-2 weeks of topical treatment
- Atypical presentation or multiple sites with different morphological characteristics 4
Pre-biopsy blood work should include:
- Complete blood count (to exclude anemia, leukemia)
- Coagulation studies
- Fasting blood glucose
- HIV antibody and syphilis serology
- Consider serum autoantibodies (Dsg1, Dsg3, BP180, BP230) if bullous disease suspected 4
Systemic Treatment Considerations
Progress to systemic medications only when:
- Disease is severe or progressive
- Topical treatments fail
- Underlying systemic disease is identified 1
Key Clinical Pearls
Diagnostic Features of Simple RAU:
- Well-demarcated, oval or round ulcers
- White or yellow pseudomembrane
- Surrounding erythematous halo 4
Common Pitfalls to Avoid:
- Do not dismiss ulcers lasting >2 weeks as "just canker sores"—these require biopsy to exclude malignancy or systemic disease 4
- Hyperglycemia predisposes to fungal infections that can mimic aphthous ulcers 4
- Multiple biopsies may be needed if ulcers involve multiple sites with different morphologies 4
Treatment Goals
The primary objectives are reducing pain, promoting rapid healing, and preventing recurrence 5. Hyaluronic acid-based gels achieve these goals with minimal side effects, making them particularly attractive for patients requiring repeated treatment courses 2. Topical corticosteroids, while effective, carry risks with prolonged use (2-3 weeks or longer), making them less ideal for frequently recurring cases 2.