Rectal Blue Nevus: Distinguishing Features of a Rare Entity.

A 26-year-old African American man with a history of depression and tuberculosis presented to the gastroenterology department after several months of rectal pain with bowel movements. Colonoscopy revealed hyperpigmentation in the distal rectum and internal hemorrhoids, which resulted in a diagnosis of blue nevi. This is only the third known description of a blue nevus involving the gastrointestinal mucosa.