instruction: hello doctor I was chewing tobacco for the past few years and I stopped it forever but sometimes I have a little throbbing on my gums and the color of my gums changed to black is this any serious disease
output: hello it is good that you stopped chewing tobacco for how many years you had a habit of tobacco chewing and what was the frequency at what site you used to keep the tobacco does the change of color of your gums is limited or it is generalized do you have any burning sensation over that site any loss of taste above all counter questions are necessary to rule out possibilities so kindly answer so that we can come to the diagnosis and can plan treatment I would like to see the images of your concern area that is your gums where you are noticing the change