My daughter is 4 years old and I have been watching a marble size lump on her shin for the last two weeks. There was no apparent injury that I am aware of, it is painless, and has not changed size at all. I can move it a little but I do believe it is fixed. I am wondering what this could be or if I should have it evaluated?She is an otherwise completely normal, healthy 4 year old. If she had bumped her leg, as all 4 year olds do during the summer, could it still be part of the healing process? I have never noticed a scratch or any bruising in the area.