Hello,
I can understand your concern. However, a burn by drinking hot coffee, even if it was too hot, is not known to cause burn mark on tongue that can last for 6 years. It might be some other discoloration or lesion and not the burn mark. If you are able to taste the food and if your tongue does not experience numbness, chances are less that it is a burn mark. Is it a white discoloration or black?
In case of white discoloration, it can be presence of
fungal infection called candidiasis, psoriasis,
lichen planus or precancerous lesion such as leukoplakia.
If it is black, it could be normal melanin pigmentation, melanoma - a
benign tumor, or
hairy leukoplakia. Drinking too much tea or coffee or use of tobacco products can change the tongue color too.
I would advise you to visit a
dentist for the physical examination of the discoloration as diagnosis of the discoloration is mandatory in order to decide if it harmful or harmless.
I hope this information helps you. Thank you for choosing HCM. Let me know if you have follow up questions.
Best,
Dr. Viraj Shah