Intralesional Corticosteroid Injection for Sebaceous Cysts

Introduction to Intralesional Corticosteroid Injection

• The American Academy of Dermatology recommends using triamcinolone acetonide 10 mg/mL for intralesional injection into a sebaceous cyst, with a typical injection volume of 0.1-0.3 mL per lesion, which delivers 1-3 mg of triamcinolone per cyst 1

Why Triamcinolone, Not Depo-Medrol

• Triamcinolone acetonide is the established intralesional corticosteroid for inflammatory skin lesions, including nodular acne and similar cystic structures, as specified in American Academy of Dermatology guidelines 1
• The standard concentration for intralesional use is 10 mg/mL triamcinolone acetonide, which may be diluted with sterile normal saline to 5 or 3.3 mg/mL for more superficial or smaller lesions 1

Specific Dosing Recommendations

• For inflammatory nodular lesions, inject 0.1-0.3 mL of triamcinolone acetonide 10 mg/mL directly into the lesion, delivering approximately 1-3 mg of active corticosteroid per injection site 1
• The goal is to flatten inflammatory lesions within 48-72 hours 1

Critical Safety Considerations

• Local overdose can result in skin atrophy, pigmentary changes, telangiectasias, and hypertrichosis, which are dose-dependent complications that may be permanent 1
• Repeated injections can suppress the hypothalamic-pituitary-adrenal axis, particularly with large volumes or multiple injection sites 1
• Sterile abscess formation is a recognized complication of intralesional corticosteroid injection 1

Clinical Pitfalls to Avoid

• Injecting too superficially causes dermal atrophy, so ensure the needle tip is within the cyst cavity or deep dermis 1
• Using concentrations higher than 10 mg/mL increases atrophy risk without improving efficacy for most lesions 1
• This approach is efficacious for occasional or particularly stubborn cystic lesions but not an effective treatment strategy for patients with multiple lesions 1