I'll check back. Derms offices always have charts, too that show good mole vs. bad mole. But don't google it - it's a never ending cycle from there :) worst case scenario is they remove it (I think you can even ask them to if it is bothering you - not sure if that is just because I have a family history...) and you'll have a little hole-scar thing for a bit, then you'll be fine. Melanoma itself ( not basal / squamous cell carcinoma!) is a cynical cancer when you let it run rampant or catch it too late, or you have an unknown gene mutation that can cause it to just happen spontaneously - very rare, and you probably would have already known about it.
Melanoma foundation has a lot of good info - try their website! They try to prevent widespread panic but do a good job of getting their point across of what should get looked at it and what is just a normal mole!