The variant of normal coloration seen on the mandibular gingival surface of this patient is referred to as:

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The mandibular gingival surface in this patient has a darker pigmentation, which is referred to as melanin pigmentation. This is a common variant of normal coloration, especially in individuals with darker skin tones. Lingual varicosities refer to visible veins on the lingual surface of the mandibular anterior teeth, leukoedema presents as a milky white opalescence on the buccal mucosa, and linea alba appears as a raised white line on the buccal mucosa.

The Variant of Normal Coloration Seen on the Mandibular Gingival