Abstract
Funding sources: This work was supported by the Brazilian Federal Agency of Support and Evaluation of Postgraduate Education (CAPES). Conflicts of interest: none declared. Madam, Amalgam tattoo is the most common exogenous pigmentation of the oral mucosa1, 2; surprisingly, there are no reports of similar lesions on the skin. It is caused by traumatic implantation of amalgam fragments into the oral mucosa following dental treatment, particularly when amalgam fillings are removed with high‐speed instruments. Amalgam tattoo occurs mostly in the gingiva and alveolar mucosa. Clinically it presents as an asymptomatic bluish to black macule, eventually observed by the patient or discovered during routine dental treatment. Histologically it shows brown to black aggregates of granules interspersed among collagen fibres and around blood vessels. Most cases show a slight inflammatory response, and eventually a foreign body granulomatous reaction is found.1–4 Cases of cutaneous localized argyria are uncommon, and are usually attributed to trauma, acupuncture, topical silver‐based medication or use of pieces of jewellery such as earrings.5–7 We report a case of cutaneous amalgam tattoo caused by implantation of amalgam particles on the skin of the eyebrow of a dental surgeon.
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