Bismuthia is a rare dermatological condition that results from the prolonged use of bismuth.
Much more rarely than with silver, bismuth may produce a generalized persistent skin discoloration resembling argyria.
It is extremely rare, and as a consequence is poorly understood by modern medicine.
Special stains and spectroscopic methods must be utilized for identification of skin pigments affected by bismuth.
On even rarer occasions, bismuth has been reported to cause pigmentation of the vagina and cervix.