What is on this egg? Or causing this?

[HopeWoo]

What causes this on eggs? My olive eggers second egg, and it’s actually part of the egg. Not just dirty. Thoughts?

 

[FunClucks]

Malfunction of the shell gland pigmentation. She's a new layer - give her a month or two and her system should settle out. Some chickens do this periodically, and others do one or two eggs like this when stressed and then are fine the rest of the time.