FLOTCH syndrome is a rare, genetic, cutaneous disorder characterized by leuchonychia and multiple, recurrent pilar cysts, associated or not with ciliar dystrophy and/or koilonychia. Renal calculi have also been reported. The disease is FLOTCH syndrome (MONDO_0016083, a Monarch Disease Ontology term). Also known as: leukonychia totalis-trichilemmal cysts-ciliary dystrophy syndrome.