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Some of the less common causes of Tongue mass may include: 1  Congenital lipomatoid mass. 2  Recurrent oral herpes simplex virus infection. 3  Haemangioma. Lingual thyroid.  Thyroglossal duct 1  cyst. Pleomorphic adenoma.
Tongue injuries (piercings and dental appliances) are a possible cause of black patches on your tongue especially if the injury cause sores. You can also end up with dark spots on tongue from biting or after biting your tongue. Anemia. Anemia is another possible cause of black tongue spots. Many people have reported this problem.