I think that looks like a hemangioma (birthmark that's caused by a buildup of blood vessels in the skin) they're really quite common but some kids get them in places that you don't see too often. If thats what it is they usually fade over time but if she was born with it then that's a part of her and they may not want to have it taken away, KWIM?
These are nice - the only thing I would say is that the little girl in the black and white - i know she has dark eyes but maybe there is a way to give a little teeny bit more distinction between the pupil and the iris? good job.