The surface features of the dorsum of the tongue may be an aid to a correct diagnosis. Such is the case with strawberry tongue of scarlet fever, the atrophic smooth tongue of pernicious anemia, and the blistered soggy tongue of drug eruption, but no clinical syndrome has been shown to be associated with either black hair tongue or geographic tongue.
Anatomically, the dorsal surface of the body of the tongue, which forms the anterior two-thirds of the organ, is the site for the lesions of the last two conditions. The body is separated from the root of the tongue, or the posterior portion, by the V-shaped sulcus terminalis, which is bordered anteriorly by 7 to 12 circumvallate papillae. Anterior to these the tongue is covered with filiform (thread-like) and fungiform (mushroom-shaped) papillae. The fungiform papillae, which are 0.5 to 1.5 mm. in diameter and most numerous near
WINER LH. Black Hair TongueA Comparative Study of Black Hair Tongue, Geographic Tongue, and Drug Eruption of the Tongue. AMA Arch Derm. 1958;77(1):97–103. doi:10.1001/archderm.1958.01560010099013
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