Recently I discovered these spots on some of my succulents. It had been raining heavily a week back, and now it's quite sunny. I haven't watered it since the rains fell. The spots are raised, and don't move. Some of the bumps have turned brown while some are just the color of the leaves. I thought they might be edema but not very sure.
It does appear to be edema. The plant took more water than it could transpire, but not enough to cause overwatering rot.
This happened to my succulent too. I did some research online, and it looks like it might be due to mealy bugs (those tiny little gnats). Spraying rubbing alcohol on the plant will kill the bugs and not harm the plant.