K.
If it's very red it's probably a bundle of blood vessels that is just a little crazy - called a hemangioma. I think they usually go away with time. My nephew had one on his arm - he's 9 months old and it's shrinking now. Best to get it checked if you're worried, but it's probably nothing. I think waiting until July 10 is fine.
Also see the wikipedia entry: http://en.wikipedia.org/wiki/Hemangioma - for a picture. Don't let the "possible complications" in this entry scare you - Wikipedia is NOT an official medical reference (though it appears correct here). Most of these resolve themselves.