Harold presents with a central single strip in his fingernails,which has been there for 2 months after he hit his hand in the door. He has a history of sun exposure and says that perhaps he remembers it being there beforehand as well.

Darier Disease

Subungual Melanoma

Subungual Haematoma from trauma

Causes of central single strip – longitudinal

• Darier disease
• Hereditary
• Congenital
• Mechanical trauma
• Melanoma

Reading

1. Murtaghs General Practice Chapter 129 – http://murtagh.mhmedical.com/content.aspx?bookid=1522&sectionid=116046129
2. Murtaghs Practice Tips – Chapter 8 – Nail Problems – http://murtagh.mhmedical.com/content.aspx?bookid=1920&sectionid=143276631

Podcast

1. GP Core Content Podcast Episode 150 – Dermatology | Nails