Question: Can you identify this condition?

A 36-year-old woman presents with an asymptomatic, hypopigmented skin lesion on her left foot, which has been there since birth. Physical examination reveals an irregularly marginated whitish patch with peripheral islands of normal skin on the dorsal aspect of the foot. Scratching both the normal and affected skin produces erythema in the normal skin but not within the lesion. Her medical history is unremarkable and members of her family are not similarly afflicted.

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