case 348 what's black hairy tongue? lingua villosa Nigra, tetracycline, melanosis, leucoplakia ,navi Congenital Melanocytic Macule of the Tongue in a Newborn Cureus COM Dec. 2011 Diagnosis UW School of Dentistry A 9 year old boy presented for evaluation of dark spots on the tongue. The family first noted these spots 5 months prior and reported that they remained stable. Can you make a diagnosis? Oral Mucosal Melanosis IntechOpen