JAMA. 1910;55(25):2117-2123. doi:10.1001/jama.1910.04330250013005.
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The subject of hairy or black tongue has engrossed a varied degree of attention in dermatologic literature. A comparatively large number of the cases, chiefly from French and English sources, were reported at the time of the discovery and early mention of the affection. Brosin1 recorded some forty odd cases reported prior to 1888. The next large increment of cases occurred when investigators first took issue in regard to its parasitic or non-parasitic nature, which has remained a more or less unsettled point of contention to the present day. Relatively few cases have been reported in recent years, not so much because the affection is possibly more rare or exceedingly infrequent as because little additional information could be offered regarding its etiology, pathology and treatment. There are scarcely a hundred eases recorded in the literature at the present time, and if the spurious and unauthenticated cases were eliminated the


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