title: Nail pigmentation abnormalities.
abstract: Color changes of the nail unit may be innocent or may be associated with disease. Four tables provide the reader with a means of categorizing pigmentation abnormalities in the following manner: changes attributable to systemic disorders and some predominantly dermatologic conditions, changes caused by systemic drugs or ingestants, changes attributable to local agents, and changes attributable to some named nail entities.
mesh_terms: D001706:Biopsy; D005385:Fingers; D006801:Humans; D009260:Nail Diseases / Q000209:etiology*; D009262:Nails / Q000473:pathology; D010859:Pigmentation Disorders / Q000209:etiology*; D014034:Toes