Good morning y'all. Last year I took in 8 chickens from a friend who couldn't take care of them anymore and I notice in a couple of their eggs they had black spots inside the egg at the top of the inside of the shell. I also noticed in the same egg that the whites would always have little red/black spots. I just wanted to get others opinions and know if they are still safe to eat and if someone else has experience the same thing? Also I noticed a few of my chickens has the same thing some times but not all the time.The black dots on the inside of the shell don't move when I try to rub them.