| Pterygium unguis | |
|---|---|
| Other names | Dorsal pterygium | 
|  | |
| Specialty | Dermatology | 
| Causes | Lichen planus | 
Pterygium unguis (or dorsal pterygium[1]: 660 ) forms as a result of scarring between the proximal nailfold and matrix, with the classic example being lichen planus, though it has been reported to occur as a result of sarcoidosis and Hansen's disease.[2]
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