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Tongue hairy

Definition: A benign condition of the tongue characterized by hypertrophy of the filiform papillae that give the dorsum of the tongue a furry appearance. The color of the elongated papillae varies from yellowish white to brown or black, depending upon staining by substances such as tobacco, food, or drugs. (Dorland, 27th ed)

Synonyms (terms occurring on more labels are shown first): hairy tongue

More information: PubMed search and possibly Wikipedia

Drugs with this side effect