I have an interesting one

. 1000's of tiny pin head sized bumps have appeared on the bottom of my 2014 JP 85 Free Style Wave Full Wood Sandwich board. I've owned this board since brand new in 2013 and it's given me 5 years of the best and happiest B&J sailing. Puts a grin on my face every time I use it and makes me gybe like a pro

. Could anyone hint at what these bumps are and what caused them ?. I'm pretty sure I didn't have them two months ago.
When I lived 40km from my local, this board used to be stored wet in a bag inside my car when I would go to work for the day (but with zip open) and sail after work. However, I have moved closer to the my local, for the past year, I go home and pack. So, this board isn't stored in hot car anymore. I also have a 2015 JP 102 FSW FWS that had much harsher storage treatment. It was sometimes stored wet on the roof racks (with zip open). However, this board does not have these bumps. All boards are stored in a spare room, removed from bags and vented when not in use.
I did some very big jumps a few weeks ago at North Haven and accidentally landed a few of them flat. I sail 24 knots like a nut job across a very choppy Semaphore water (I'm 73kg). Not sure if both these situations do this wood board any good ?. Could this be cavitation damage ? or flexing damage ?
Should I sand it a bit and see what happens ?. Pics below:


Area effected: