I had a mole since childhood that changed and I also thought it was nothing until my dermotologist took a biopsy and told me it was cancer...Very first stage. Had it removed and thankfully no further treatment since it was caught at its earliest stage.
If any mole on your body makes you uneasy, it is best to have it removed. I had a mole for years that made me nervous. My GP told me to just keep an eye on it. Bad idea. I'm not a doctor! I can't objectively tell if it's changing. I finally went to a dermatologist years later and she didn't like the looks of it either. She immediately removed it for a biopsy, and thankfully it was benign. But if I ever have another mole that makes me nervous, I will have it taken out right away. It doesn't cost much, it doesn't hurt, and it's one less thing to worry about!