Granuloma annulare possibly triggered by antitetanus vaccination

Area of Science:

• Dermatology
• Pediatric Dermatology
• Immunology

Background:

• Granuloma annulare (GA) is a benign inflammatory skin condition characterized by granuloma formation.
• The etiology of GA is largely unknown, but associations with infections, trauma, and vaccinations have been suggested.
• Previous reports have described papular lesions at vaccination sites, but not specifically GA following antitetanus vaccination at the injection site.

Observation:

• A 6-year-old girl experienced multiple episodes of GA.
• The first two episodes occurred independently of vaccination.
• A third episode of GA developed at the site of an antitetanus vaccination, with subsequent lesions appearing on her legs.

Findings:

• This case presents granuloma annulare occurring at the site of an antitetanus vaccination.
• The temporal association and localization suggest a possible link between the vaccination and the localized GA.
• Histopathological findings in similar vaccine-associated lesions suggest necrobiotic granuloma, a feature also seen in GA.

Implications:

• Antitetanus vaccinations may potentially trigger granuloma annulare in susceptible individuals.
• The mechanism could involve local trauma from the injection or a vaccine-induced immune response.
• Further investigation is needed to understand the relationship between vaccinations and granuloma annulare.