A 60-year-old Black man with hypertension and type 2 diabetes presents with a 1-month history of a yellowish, green furry plaque on his tongue.

Source: Focus Medica. A harmless, temporary condition characterized by tongue discoloration. Black hairy tongue occurs when the papillae (the upper surface of the tongue) on the tongue are unable ...

However, if you find your tongue is smooth and red, alongside pain in your mouth, it could be a sign of a vitamin B3 deficiency, according to a report in Mirro.co.uk. Having a black fur-like ...