I understand your paranoia, but scratching a mole does not transform it into a cancer. It can change the appearance a little, and that's what you're describing.
Look, just leave it alone for a couple of weeks so it can go back to its previous state. Then show a dermatologist one more time. If the doctor is absolutley, positivly sure it's OK (which will probably be the case), then I would forget about it once and for all.
Or you can ask the doctor to just take it off so you won't have to think about it any more, if you think you're going to keep worrying anyway, despite reassurance.
So, the fact that the mole is a lighter shade than it was before it was scratched is not a sign of concern?
Correct--not by itself.
I would just like to confirm that scratching or picking at a mole will not increase its likelihood of cancer.
That is correct--traumatizing a mole doesn't lead to cancerous change.