I think it's sensible not to want to analyse why it happened because it's not helpful as you say. It just gives it significance which isn't warranted...
They definitely don't have to bleed. The first time I got one it was just like this - a swollen lump that was sore to the touch. I would keep trying...
I've been down the mole hole a few times. But, one thing I've learned is that there's just as good a chance of an existing mole developing cancer as...