Scrabble Merchants peter

Should I be concerned about these brown blisters on my gums? - blisters on the gums

My chewing gum on the floor hurts under my molars on the right side. Gland on my right side hurts me. I looked in the mirror and saw that there brown spots / blisters on his teeth. What are these? I am very worried. Used to dip snuff, but no more. I am very scared and stressed out. I received this today and have thought about it since.