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(A) Labial mucosa fragment lined by squamous epithelium with marked acanthosis, spongiosis, hyperkeratosis and no keratinocyte atypia, with a dense lymphoplasmacytic infiltrate in the deeper areas without granulomas, with focal lichenoid change (Hematoxylin & eosin, ×100). (B) Positive immunostaining for podoplanin in subepithelial lymphatic vessels (Hematoxylin & eosin, ×100).
