Monarch Disease Ontology entry MONDO_0015780 (dyskeratosis congenita) (DC) is a rare ectodermal dysplasia that often presents with the classic triad of nail dysplasia, skin pigmentary changes, and oral leukoplakia associated with a high risk of bone marrow failure (BMF) and cancer. Also known as: DC, DKC, Zinsser-Engman-Cole syndrome.