Intralesional Triamcinolone Acetonide After Keloid Excision
After keloid removal, intralesional triamcinolone acetonide injection should be administered postoperatively, starting within one week after suture removal, then repeated every 2-4 weeks for 3-6 months. This approach has consistently demonstrated the lowest recurrence rates compared to pre-operative or intra-operative injection timing 1.
Injection Protocol
Timing and Dosing
- First injection: Within 1 week after suture removal 2
- Concentration: Triamcinolone acetonide 40 mg/mL (undiluted) 3
- Frequency: Every 2-4 weeks 4, 2
- Duration: Continue for 3-6 months based on clinical response 4, 5
- Total sessions: Typically 3-6 injections 4
Injection Technique
Inject directly into the dermis at the excision site using a 25-27G needle. The goal is to infiltrate the entire surgical site and 1-2 mm of surrounding normal-appearing skin until blanching occurs 3. Volume depends on lesion size, typically 0.1 mL/cm² 3.
Evidence Supporting Post-operative Timing
The most recent meta-analysis 1 definitively shows post-operative steroid injection results in significantly lower recurrence rates compared to both intra-operative (p < 0.001) and pre-operative injection (p = 0.009). Multiple clinical series support this approach, with recurrence rates as low as 0-5% when post-operative triamcinolone is used after excision 6, 4, 2.
Combination Therapy Option
For particularly aggressive or recurrent keloids, consider combining triamcinolone with 5-fluorouracil (50 mg/mL) in a 1:1 ratio 7, 8. This combination provides more reliable flattening and symptom control than steroid monotherapy 7.
Clinical Monitoring
Continue injections based on clinical signs:
- Stop criteria: Complete flattening, no induration, absence of symptoms (pain, pruritus, paresthesia) 5
- Continue criteria: Persistent elevation, firmness, or symptoms 5
- Follow-up duration: Monitor for at least 12-24 months post-treatment for recurrence 6, 4
Important Caveats
Avoid injection at these sites: Fingers, nose, ears, eyelids, near lips, or anywhere vascular compromise is a concern 3. For auricular keloids specifically, this protocol is highly effective with documented 95-100% success rates 6, 4.
Common adverse effects: Local skin atrophy, pigmentary changes, and telangiectasias may occur but are generally acceptable trade-offs for preventing recurrence 3. Systemic effects are rare with intralesional administration 9.
Pain management: Pre-medicate with topical anesthetic (EMLA cream: lidocaine/prilocaine) before injection 3. Young children may require sedation or general anesthesia 3.
The key to success is starting injections early in the post-operative period and maintaining regular treatment intervals until complete resolution is achieved, rather than attempting to prevent recurrence with pre- or intra-operative injection alone.