Nail dystrophies.

Various individual nail dystrophies that are not easily categorized within other articles are reviewed. Onychoatrophia, anonychia, onychorrhexsis, leukonychia, Beau's lines, onycholysis, onychomadesis, onychoschizia, haplonychia, longitudinal melanonychia, and ventral pterygium are included and clinically pictured. Their clinical description, etiology, associated conditions, differential diagnoses, and treatment are discussed and tabulated. In addition, several clinical severity-scoring methods are presented.