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Onychophosis is a localized or diffuse hyperkeratotic tissue that develops on the lateral or proximal nailfolds, within the space between the nailfolds and the nail plate, and is a common finding in the elderly.[1]: 784 

Onychophosis may involve the subungual area, as a direct result of repeated minor trauma, and most frequently affects the first and fifth toes.[1]: 784 


  1. 1.0 1.1 James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. ISBN 0-7216-2921-0.