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Updated: May 24, 2025
Artificial discolorations of the skin are generally produced by tattooing, by silver nitrate, mercury, bismuth, or some other metallic salt. Melasma has been designated as an accidental and temporary blackish discoloration of the skin. There are several varieties: that called Addison's disease, that due to uterine disease, etc. In this affection the skin assumes a dark and even black hue.
Crocker believes that the disease is an atrophic degeneration of the skin, dependent on a primary neurosis, to which there is a congenital predisposition. Nigrities is a name given by the older writers to certain black blotches occurring on the skin of a white person in other words, it is a synonym of melasma.
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