If it is cracked and water can get in you want to repair it. If not keep an eye on it and see if you can suck any water out of it when you are done surfing. You can also tape the area off exccept where your small chip was and spray acrylic clear spray paint on the damaged area. The acrylic clear will go into the small cracks and help seal them off, so water can't get in, and will not look bad because it is a clear finish. You may want to spot test a little before applying to much on your board to make sure it does not orange peal and is compatable with your board finish. Your other option is just sand the ding down and fix it with some fiberglass cloth and you know it is sealed up then. Good Luck! One small ding will not take that long to fix.
Tony
http://safaritownsurf.com