Nevus Comedonicus

**Semantic type:** Disease or Syndrome

**Definition:** 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.

**Synonyms:** - Acne Nevus - Acneiform Nevus - Comedo Nevus - Pilosebaceous Nevoid Disorder