1. Anatomy and physiology of the nail unit -- 2. Abnormalities of the nail contour -- 3. Psoriasis -- 4A. Onychomycosis -- 4B. Future therapies for onychomycosis -- 5. Lichen planus -- 6. Pseudomonas infection -- 7. Herpes simplex (herpetic whitlow, herpetic paronychia) -- 8. Warts -- 9. Acrodermatitis continua of Hallopeau -- 10. Acute paronychia -- 11. Chronic paronychia -- 12. Yellow nail syndrome -- 13. Eczema -- 14. Nail fragility syndrome -- 15. Onycholysis -- 16. Onychotillomania -- 17. Nail abnormalities in oncology practice -- 18. Bowen's disease -- 19. Squamous cell carcinoma -- 20. Melanonychia -- 21. Longitudinal erythronychia -- 22. Exostosis -- 23. Glomus tumor -- 24. Myxoid pseudo cyst (mucous cyst, ganglion) -- 25. Nail cosmetics and real nail prostheses -- 26. Onychocosmeceuticals -- 27. Nail surgery -- 28. Complications in nail surgery -- 29. Biopsy of the nail area -- 30. Matricectomy -- 31. Removal of the proximal nail fold : why?.