– Black or bluish-black (usually) solitary, nonelevated small pigmented area beneath normal mucosa; usually related to lower ridge or buccal vestibule; more rarely palate and floor of the mouth.
– It is asymptomatic and may rarely be radiopaque.
– Common: mainly in adults.
– Amalgam particles or dust can become incorporated in healing wounds after tooth extraction or apicectomy or beneath mucosa (i.e. after an abrasion with a bur or elevator).
– May need to excise to exclude melanoma microscopically.
– Differentiate from other causes of pigmentation, especially naevi and melanoma.