Hi and welcome!
Congratulations on your new baby! Yay! I love the babies.
I'm with both of them...I can't tell what that is.
My suggestion would be to look in the Baltimore area and find a specialist in birthmarks, not necessarily a dermatologist. I know we have lots of listings in your region, but find a doctor who deals with all kinds of birthmarks.
You can also write in to one of our experts at http://birthmark.org/experts.php
I suggest asking Dr. Levitin and Dr. Nelson.
Let us know what happens!