<unk>  (or dorsal<unk>  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.
Pterygium unguis
Pterygium inversum unguis
Penis captivus
Periorbita
Caput Medusae
Caput medusae
Vesical tenesmus
Oral torus