How big is that model? Have you printed it before, without the unwanted artifacts? Are they present only on that side of the print?
You could try increasing the size and density of supports, play with the orientation, make sure the optical path is clean, and that the resin is fresh and mixed.
Or it could potentially be a case of the known “ripple” effect suffered by the Form 3 (perusing the Form 3 section will pull up other examples, like here and here). Either way, I’d open a ticket with Formlabs Support.