<s>[INST] Hi I noticed a irritated feeling on the tip of my tongue 4 days ago. At first it looked like my taste bud was slightly inflamed (it was literally a tiny red dot), two days later the tiny red dot turned into a black dot. On the third day the dot was a white color. It still has the irritated feeling (as if I had burned my tongue drinking something hot). What do you think is the cause of this? [/INST] Thanks for your query, the reddish spot would be an ulcer secondary to trauma or viral infection...or the blakish color could be due to food debris...the whit area could b an elongated papillae or secondary to chronic irritation....nothing to worry if it is troubling you consult a oral physician... </s>