From: Clinical guidelines for the recognition of melanoma of the foot and nail unit
Melanonychia | Subungual bleeding |
---|---|
Benign racial melanonychia | Direct trauma |
Laugier Hunziker | Indirect microtrauma-end on repetitive trauma |
Inflammation | Haemorrhagic tendency lowering threshold for effects of trauma. eg |
   • Lichen planus |    • warfarin |
   • Chronic paronychia |    • leukaemic |
   • Trauma/friction |    • thrombocytopaenia |
   • radiation |  |
Medication e.g. | Subungual tumour |
   • Minocycline |    • squamous cell carcinoma |
   • Chemotherapy |    • wart |
   • HIV disease or medication |    • exostosis |
 |    • melanoma |
 |    • pyogenic granuloma |
Addison's disease | Â |
Peutz Jeghers | Â |
Subungual naevus | Â |
Benign melanocyte activation | Â |
Melanoma | Â |
Bowen's disease (in situ squamous cell carcinoma) | Â |
Onychomycosis | Â |