A Case of Eruptive Collagenoma

Abstract

A 37-year-old Japanese woman, who had first noticed asymptomatic eruptions on her trunk 4 years earlier, presented with scattered soft nodules that had a white to normal skin color. A biopsy specimen revealed increased amounts of collagen in the dermis. Collagen bundles were thickened and irregularly arranged. Elastic fibers were scanty and partially fragmented. She was otherwise in good health and there was no family history. These findings led us to make a diagnosis of eruptive collagenoma, a type of connective tissue nevus, according to the classification of Uitto. The patient was under control without any treatment, because there were many lesions.