Oh, it's fine you whiner . That will have approximately zero effect on your readings.
Prove it to yourself. Find a stable laser. Take a reading on the spot, then take a reading off the spot. Whichever you do second might read lower especially if it is a diode laser. If so, wait an hour and repeat the process in the reverse order.
If I turn out to be wrong, you can always just avoid that spot.
I would think the mark would have to really change the reflecting, or absorbing property of the surface. On something that's so sensitive, I can see reason for concern, but the marks really don't look bad at all.
That's it? I was expecting to see a pitted crater with smoke stains or something. That doesn't look bad at all. You should just continue using your meter without worrying.