burst

I had a silkie egg in lockdown and several days after it was due to hatch I opened the incubator and checked it and saw this.. the pictures aren’t great but it almost looks like bleeding under the shell when I candle, like the blood vessels have burst.. what could have caused this?

I have an eight year-old hen who has what appears to be an ingrown feather on her saddle feathers area. She is a stress-plucker, so no doubt that has caused the issue (she *really* doesn't like temperature changes). My question is: how is it best to "burst" the feather? I have small sterile...