Black Hairy Tongue (BHT) Definition, Causes, Treatment Black hairy tongue syndrome 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? Can a black pigmented lesion of the oral cavity : Journal of Family Medicine and Primary Care Congenital Melanotic Macule of the Tongue: Report of Two Cases and Literature Review Head and Neck Pathology Springer Nature Link Figure 1 from Oral Melanosis Semantic Scholar