Minocycline-related black thyroid.

Black pigmentation of the thyroid gland has been observed in patients chronically taking minocycline antibiotics. Pigment changes of the skin, blood vessels, and bone have also been reported. Some of these changes may be caused by traumatic or toxic etiologies, therefore persons conducting forensic death investigations need be aware of minocycline-related changes. This article reviews pigment changes of the thyroid gland and discusses the potential forensic import of such findings.