Isolated collagenoma developing on the scalp

Connective tissue nevi are hamartomas consisting of one or several components of dermal connective tissue, including collagen, elastin and glycosaminoglycan [1]. Isolated collagenoma (IC) is a rare type of connective tissue nevi that is categorized as an acquired collagenoma. IC presents as a hamartomatous overgrowth of otherwise normal collagen [1]. These lesions can be hereditary or sporadic. Generally, collagenomas are asymptomatic and usually occur on the upper trunk, arms, back, thighs and soles, [...]