As Peter B points out, it was Apollo 16 that had the most distinctive damage to the micrometeroid panels on the aft equipment bay of the LM. I don't think it caused any particular harm because the panels were not structural; the pressure vessel was well inside, and the aluminized Mylar thermal blankets underneath were still intact. The panels were intended to serve as the outer layer of a Whipple-type micrometeoroid shield, but that seems to have been an overblown hazard for Apollo and I have never heard of any problems on any of the missions, even the earth orbital ones. (The same is not true for the Shuttle and ISS because space debris has become far more serious in low earth orbit since Apollo.)
Hoaxers often ridicule the flimsy appearance of the LM, not understanding that the external surface was not the load (or pressure) bearing structure, or that one does not need aerodynamic surfaces in space.
Apollo 15 also had problems with a white paint used on some of these thermal panels, most notably on the +Y and -Y surfaces of the ascent stage. You can see them bubbled and cracked in pictures of the LM on the lunar surface. Apparently that occurred during cold-soaking on the way to the moon.
