Suggest Remedy For Bruises

Hi! My son plays basketball and he jumped to block a ball in play about a year ago. He got injured and his side was bruised badly. aS time went on, he got better but, I noticed the other day, the bruise is still there just faded a little. I asked him was he still in pain and he said that it didn't hurt. The bruise appears to be a permanent mark. Should I be concerned with this?