No, not without seeing it in person. Maybe just an imperfection in the shell.
My egg just had thatThanks (not russians, Red Eared Sliders )but (call me over paranoid) I just went to check on it again, and it had literally exploded! The end is all cracked open, I thought the shell felt soft This sucks, I haven't seen any more eggs from her yet
Why did it do this? To hot? To cold? Wasn't fertile?