Pathology · single question
All of the following can be included in the differential diagnosis EXCEPT:
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Correct answer: B. Actinic keratosis
Actinic keratosis (solar keratosis) occurs on sun-exposed skin (lower lip vermilion, face) — not on the buccal mucosa. Leukoplakia, lichen planus (reticular form), and leukoedema all commonly present as white lesions on the buccal mucosa and belong in the differential.