Zosteriform Collagen Nevus in an Infant.

Connective tissue nevi (CTN) are dermal hamartomas characterized by an imbalance in the amount and distribution of the normal components of the extracellular dermal matrix, specifically collagen, elastin, and/or proteoglicans. The term "CTN" was first mentioned by Lewandowsky in 1921 (1), although it was not accepted until the review by Gutmann in 1926 (2). Classification of CTN was established by Uitto et al.