Cyst on Placenta

I went for an ultrasound at 16 weeks and my OB noticed a cyst about 3 cm on my placenta. Shes gonna send me to get a more in depth ultrasound in 2 weeks, but i wanted to get some info before i go in.

Anybody have this happen to them? Is there anything to be worried about? Anything i can do to get rid of it?

Thanks!