nipple

Hello, My kitty has these blue discoloration around her nipple. since this one is close to the nipple the vet is concerned. Vet wants to remove it. Has anyone had any issues like this? She also has a bump on the tail which will be biopsied in June when she gets her teeth cleaned. This thing...

So my little Ziva keeps sucking her nipples whenever she gets comfy. She could wake up at 2:00am and strat sucking. It is getting a bit annoying. I tried to discourage her but nothing works. I wanted to see if anyone else had this issue and what can be done to stop this behavior. Thank you