My 3-year-old daughter bumped her head on the end of a bar sticking out at the playground. It wasn't sharp, but it was very hard and she had a lump. A few days later, she fell off her scooter and bumped the same area. The bruise persisted for a bit more than a week, but a small lump is still there, more than 2 months later. She doesn't complain of pain there, and if you give it a gently prod it doesn't bother her, but I'm concerned that it doesn't seem to be going away. The lump is about dime size. It isn't noticeable when you look at her, but when you run your fingers across her forehead, you can feel it. Is it normal for lumps to take this long to go away?