Who has experienced this during their second ultrasound?

Tina

I had my second ultrasound today and I was told that there was a hump on my placenta. The doctors aren’t too sure what it is so they scheduled me for another ultrasound in a month just to see if anything changes . Though I’m not too worried about it I wanted to know if anyone experience this before or can tell me what it could possibly be? The baby is doing great and there are no worries but I am just curious.