What does a cyst on the placenta mean?mother

I’m 22 weeks pregnant, and I received a call from my obgyn, he told me that I have a cyst on my placenta and that he would like for me to see a high risk doctor to have it further looked at. Everything else with baby looks great, super healthy baby, and measuring a day ahead of time. I was wondering if anyone experienced anything like this? Is there any advice you can give me to give me some reassurance that the baby will be okay? Thank you!