Onychophosis
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