question: i have a white spot on the back of my throat...you need a tongue depressor to see it. It almost looks like a blister about the diameter of a pencil eraser. My glands are not swollen and my throat is not sore. My throat may look a bit red....hard to tell. Should I be worried that this is cancer? I quit smoking about 15 years ago. I have had breast cancer ....treated with a mastectomy and chemo.