Pterygium of the nail can occur at the hyponychium or at which other nail fold?

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Multiple Choice

Pterygium of the nail can occur at the hyponychium or at which other nail fold?

Explanation:
Pterygium unguis is scar tissue that forms at the nail folds and can pull the skin onto the nail plate, altering growth. Besides the distal hyponychium, this scarring can involve the proximal nail fold, known as the eponychium. The matrix, lunula, and nail bed are not folds where this wing-like scar typically develops. So the other nail fold is the eponychium.

Pterygium unguis is scar tissue that forms at the nail folds and can pull the skin onto the nail plate, altering growth. Besides the distal hyponychium, this scarring can involve the proximal nail fold, known as the eponychium. The matrix, lunula, and nail bed are not folds where this wing-like scar typically develops. So the other nail fold is the eponychium.

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