MONDO_0014873 (nevus comedonicus syndrome) is a rare developmental skin condition consisting of abnormal pilosebaceous follicle development. It is characterized by linear or band-like distributions of groups of comedones, usually on the face, neck, upper arm, chest, and abdomen, that appear at birth or in childhood. Also known as: Nevus comedonicus, acne Nevus, acneiform Nevus, comedo Nevus, nevus comedonicus, somatic, pilosebaceous nevoid disorder.