Eruptive Collagenoma: A Rare Encounter in Clinical Dermatology

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.