Amalgam tattoo

Amalgam tattoos are a common cause of exogenous oral discolouration. They result from the iatrogenic mucosal implantation of amalgam particles during the course of a dental procedure. They are usually small, macular and blue-grey to black in colour. Amalgam tattoos are usually found in close proximity to amalgam-restored teeth or where such teeth were previously present (see Amalgam tattoo).

Amalgam tattoos are benign and do not require treatment, beyond correct diagnosis. To confirm the diagnosis, metallic amalgam particles may be evident on X-ray. If the diagnosis is not confirmed or if any 'red flag' features of oral mucosal disease are present, refer patients to an appropriate specialist.