A panoramic radiograph shows an obvious foreign body. In the same area, a corresponding finding in the gingiva is noted on clinical exam. What is this gingival finding most likely called?

An amalgam tattoo is a localized area of gray-blue mucosal discoloration caused by amalgam particles becoming embedded in soft tissue (often from a prior restoration, extraction, or trauma involving amalgam), frequently corresponding to a small radiopaque fragment visible on radiograph in the same anatomic location — an important, common, and benign cause of focal oral pigmentation.