My upper right Gum first felt like I had burnt the gum by hot food. It felt tender. After a few weeks a white legion appeared and I went to my dentist who thought it was a fistula type gingivitis infection. I was prescribed a mouth rinse for gingivitis. After a couple of weeks, the "fistula" continued to grow and became probably 1/2 inch long, just above the teeth. The periodontist said everything was fine, but did a biopsy. Two weeks later I was told the news it was SCC. When the periodontist did the biopsy he cut the entire spot out. For a few days it was gone,but the open spot felt weird and bleed a lot. In the few weeks between the biopsy and my acuatal surgery, I could feel the SCC growing quickly. So no, it did not come and go until after the biopsy.