# Eruptive Collagenoma: A Rare Encounter in Clinical Dermatology

## TL;DR

This paper presents a rare case of eruptive collagenoma, a skin condition marked by sudden skin-colored bumps in a young adult woman.

## Contribution

The novelty lies in reporting a rare clinical case of eruptive collagenoma with specific presentation on the upper back of a young adult.

## Key findings

- Eruptive collagenoma presented as multiple skin-colored papules and nodules on the upper back of a young adult woman.
- The case highlights the rarity and variable clinical presentation of eruptive collagenoma in clinical dermatology.

## Abstract

Eruptive collagenoma is a rare variant of connective tissue nevus characterized by the sudden appearance of multiple, asymptomatic, skin-colored papules, nodules, or plaques. These lesions typically occur on the trunk, upper extremities, or head and neck, most often during adolescence or early adulthood. The exact etiology and incidence remain unclear, and no consistent familial or systemic associations have been identified. We report a rare case of eruptive collagenoma presenting with multiple elevated, skin-colored papular and nodular lesions on the upper back of a young adult woman.