By Gary M. White, MD

Black Dermographism

In black dermographism, deposits of metal powder give the skin a gray or black color. The metal powder usually results from a hard metal in a topical product (e.g., titanium dioxide in a sunscreen) rubbing against a softer metal (e.g., gold in jewelry).


The darker color usually develops under a piece of jewelry, e.g., ring or bracelet.


No treatment is needed. The color washes off.

Additional Pictures

Black Dermographism


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