What are complications of yellow tongue?

Yellow Tongue. Yellow tongue is caused by enlargement of papillae and allows bacteria to hide in the recesses of the bumps saliva may change colour and the tongue looks yellowish and can give some pain, itchy sensation of mouth feel like cotton mouth, there can be yeast infection as well, and can spread to esophagus the condition is benign can be treated with medicated mouth wash, andanti fungal meds, and proper diet.