Extensive keloid formation and progression after each vaccination.

Area of Science:

• Dermatology
• Immunology

Background:

• Keloids are benign fibroproliferative tumors that arise from scar tissue.
• They are characterized by excessive collagen deposition and extension beyond the original wound borders.
• Keloid formation is more prevalent in individuals with darker skin tones and a positive family history.

Observation:

• This report details a 45-year-old female patient with extensive keloidal scars on her bilateral upper arms.
• Scarring began in childhood following routine vaccinations and progressed with subsequent immunizations at the same sites.
• The keloids developed in areas of increased skin tension, a known factor influencing keloid development.

Findings:

• Vaccination, including BCG, smallpox, and hepatitis B, can trigger keloid formation.
• Repeated vaccinations at the same anatomical locations can exacerbate keloid growth.
• The patient's keloids demonstrated progression related to ongoing vaccination history.

Implications:

• This case underscores the potential link between vaccinations and keloid development, especially in susceptible individuals.
• Understanding keloid triggers is crucial for managing and preventing excessive scarring.
• Effective treatment strategies for extensive keloids remain challenging, often requiring multimodal approaches.