Well, your dad may be a doctor, but I'm a board certified witch doctor! My recommendation is to take a mature rooster, pluck three tail feathers, tuck them behind your ear, then chant a Caribean song while slitting the throat of the rooster over a dish to capture the blood. Then drink the blood. All will be well.

Just kidding. Hey, if your dad is a doctor and he feels that it is OK to monitor the situation, I think that is a wise course to follow. He probably has thought about the worst case scenario and doesn't feel that much harm can come from monitoring the situation even if his initial diagnosis was wrong. If the swelling doesn't go down, then he'll address the problem again.