As you probably noted in my discussion of foot injuries, these usually resolve nicely on their own. I will re-emphasize my opinion - leave it alone!
The swelling should go down in a week or two. If it becomes infected, the toe will usually become sensitive to the touch and they will be again reluctant to put weight on it. Another thing to watch for (from a distance) is any discharge or increase in the size of the swelling.
Sometimes, a little careful neglect is the best medicine.