I got 4 chicks today. Three hatched last night, but one just hatched about an hour before I got there to pick them up. She has a little black clump on her her bottom. I took a wet rag and wiped at it, but it's raw, and it hurt her. The others don't have anything on their butts. Could this be pasty butt already?? Or is it maybe where she was attached to the egg? I don't wanna mess with it, but if it's something I need to take care of, then I need to know what to do.