it could be, but it could also be a pimple, scratch, etc... try to relax and stay calm until your appointment. i know it is difficult, and i did the same as far as freaking out.
my daughter is 6 weeks and has a fairly large one that goes from above her right ear and down the back of her neck, one under her chin, 2 on her lip, and a very small place below her left ear. the one on the side of her head is by far the worst. luckily we got her into a ped. derm. and started treatment right away. she has been on propranolol for a little over a week and we have seen VAST improvement. she is also using timolol, which is topical.
take comfort in knowing that there are ways to treat these, and the earlier the better. you are getting your daughter into the dr. very early, so that is great! hang in there and let us know how the dr. goes.
~Momma to Logan, 3 and Livy, 1~