Look in here:Interesting! What do egg spots look like?
So are egg spots the “meat spots”? Do you eat them or just get rid of them?Look in here:
I think it's explained in this excellent video, which is worth watching regardless:
It’s almost 7 months old. It laid another egg that was kind of faded on parts . If it is a respitory issue, is that serious and would you be concerned ?'Slab sided' egg, often indicative of a respiratory illness if not just a one off glitch.
How old is the bird that laid it?