It's pretty normal.. Unfortunatly..
My friends with Starboards had an even bigger problem with this sort of thing.. and as careful as you can be it will happen.
The best way to check if some kind of repair is nesessary is to show it to the shop where you bought it from or some else that might know.
I'm super-duper careful with my boards but over time things happen.. If you're concerned about the area where you dropped it I would recomend buying a roll of ding tape and put a patch over it to help seal it so at least you can keep paddling it..