Dolichonychia

Dolichonychia is a medical condition in which the nail beds of the fingers and toes are abnormally long and slender, specifically, a finger nail index of 1.30 or more,[1] it is a common feature in people with connective tissue disorders, such as Ehlers–Danlos syndromes, Marfan syndrome, and hypohidrotic ectodermal dysplasia.,[2] it often appears alongside arachnodactyly and/or dolichostenomelia, which is the condition of having long and slender fingers and toes.

Dolichonychia
Moderate dolichonychia of the nail beds combined with long free edges
Complications	None, but it depends on which disorder it is possibly associated with
Usual onset	Congenital
Duration	Life-long
Causes	The cause may vary among people with dolichonychia, in some, it is an isolated trait, in others, it might be a symptom of a connective tissue disorder, such as Marfan syndrome