Since the lesion is small and is not growing so far and is not interfering with feeding, I think it's absolutely appropriate to wait for your appointment.
What you describe could be PWS or a hemangioma. Hemangioma usually will grow some and PWS can be a little "bulgy." The treatments are different, so you really need someone to look at it and say for sure.
If you put up a pic, it might be clearer. You could send one to one of our experts at http://birthmark.org/experts.php
and they will give an opinion.