Anatomy and physiology of the nail unit * Psoriasis * Onychomycosis * Novel and emerging pharmacotherapy and device-based treatments for onychomycosis * Lichen planus * Onychotillomania (onychophagia, habit tic, median canaliform onychodystrophy) * Eczema * Acrodermatitis continua of Hallopeau * Herpes simplex (herpetic whitlow, herpetic paronychia) * Acute paronychia * Chronic paronychia * Warts * Yellow nail syndrome * Onycholysis * Nail fragility and beautification * Nail prostheses * Nail pigmentation * How to prevent and treat chemotherapy-induced nail abnormalities * Intralesional nail therapies * Drug side effects on the distal phalanx * Classical nail surgery and removal of the proximal nail fold * Surgery of some common nail tumors * Nail surgery complications * The painful nail * Radiation and the nail