Mongolian spots?

Jennifer

Did/does anyones baby have what looks like bruising around baby’s lower back and bottom/butt area?

My baby is 5 weeks and all of a sudden has a blue/gray butt and lower back…his skin is bluish. No other symptoms and it doesn’t bother him. I’ve googled it and it looks to be what’s called Mongolian spots but I’m not 100 percent sure there isn’t more to it.

Anyone experience it and if so, should I call his doctor or is it not a big deal?