# Vaccine-Induced Lichen Planus in a 12-Year-Old Patient: A Rare Pediatric Case

## TL;DR

A 12-year-old boy developed lichen planus, a skin condition, after a tetanus vaccine, highlighting the rare immune reaction and the role of dermoscopy in diagnosis.

## Contribution

This case is one of the few reports of vaccine-induced lichen planus in a pediatric patient, emphasizing its recognition and diagnostic utility of dermoscopy.

## Key findings

- A 12-year-old male developed lichen planus two weeks after a tetanus vaccine.
- Dermoscopy aided in the non-invasive diagnosis of lichen planus in this case.
- Vaccine-induced lichen planus is rare but should be considered in pediatric patients with new skin lesions post-vaccination.

## Abstract

We report a rare case of vaccine-induced lichen planus (LP) in a 12-year-old male patient who developed generalized pruritic, violaceous, flat-topped papules and plaques two weeks after receiving a tetanus vaccine following a puncture wound. Clinical evaluation, dermoscopic examination showing Wickham striae and follicular hyperkeratosis, and histopathology confirmed the diagnosis. Vaccine-induced LP remains an uncommon but possible immune-mediated adverse reaction. Dermoscopy proved valuable for non-invasive diagnosis, aiding in distinguishing LP from other dermatologic conditions. This case emphasizes the importance of considering vaccine-induced LP in pediatric patients presenting with new-onset lesions post-vaccination and highlights the role of dermoscopy in early recognition and management.