A 13-year-old boy presents with asymptomatic lesions involving the mucosal aspects of his upper and lower lips. The lesions have been increasing in size and number over the past 5 months. He is not sexually active, is not taking any medications, and does not have a family history of a similar condition. Skin examination reveals multiple soft, mucosa-coloured papules, 2 to 8 mm in length, some with a verrucose surface, scattered over the upper and lower aspects of the labial mucous membrane. The rest of the mouth, including the vermilion border and the tongue, is free of lesions.
The most likely diagnosis is
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Irritation fibromas
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Mucosal neuromas
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Focal epithelial hyperplasia
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White sponge nevus
Answer on page 1417
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