A few weeks ago, D tripped going into the little bathroom at daycare and smacked his head on the toilet. He came home with a goose egg and a bruise, but otherwise was totally fine. The lump went down by the next day, and within a week, the bruise was gone. But the other night I was playing with his hair and realized that he has a small bump there on his head where he had hit it. It's been a month! It's a hard bump, not like the soft swelling he had right after it happened. Will it ever go down? Do we need to be concerned?