Yeah..that just looks like egg gunk in this pic. The first one almost looked like an attached lump.Here’s a couple pics....they aren’t the best, but man it’s hard to get good pics of him! He’s constantly moving around trying to stand up!! I love his determination!
That will wear off eventually.
As for the legs..
Try to determine if it's feet are just curled up and unable to flatten out or if it's a leg lameness issue.
I would get it out if the incubator now. After the first 24 hours it doesn't need to stay as warm as your incubator would be plus it should start eating and drinking a bit.
Do you have nutri drench?
That could help with leg weakness if that's the issue.