Repair poke surfboard bottom

Hey there,
I did a poke on the bottom of my surfboard without water infiltration. Actually, the board hit my head and made this poke on my surfboard bottom.
Anyways, i would like to know if you have any tips to remove this poke on the bottom. I heard some people use a hair dryer to do that. Maybe you have some others tips or maybe you let it like that.
Aloha.
Eric.

…let it like that.
If you do not have entry water 99% of people let it like that.
The only possible way to repair it is cutting the glass work, cut the foam the fit another piece of foam and re glass; aesthetically you could not match anything that you would have besides but you will have a flat surface.