Pterygium inversum unguis (also known as "Pterygium inversus unguis,"[1] and "Ventral pterygium"[2]:660) is characterized by the adherence of the distal portion of the nailbed to the ventral surface of the nail plate.[3]:788 The condition may be present at birth or acquired, and may cause pain with manipulation of small objects, typing, and close manicuring of the nail.[3]:788
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