Black coating on tongue, had taken pepto bismol for diarrhea, history of acid reflux. Help?
I woke up this morning with a black coating on my tongue . I had diarrhea the night before and took pepto bismol to help relieve the diarrhea. I have acid reflux and at one time I had ulcers on the back of my tongue which caused a small amount of brown when scraping my tongue, but nothing like this dark coating that covers my entire tongue that I am scraping dark substance from the back of my tongue.