My Jade plant has these spots on some of the leaves. The jade is not in hot sun and other than these blackish brown spots the jade is doing great. I don't see any insects either. Just wondering if anyone knows why this is happening. See picture below. Thanks

Its probably edema. It happens when there is more moisture in the plant than it can handle. Cool weather, overwatering, high humidity, lack of air flow or a combination. The plant either rots or forces the excess moisture out through the pores in the leaves resulting in scars. Scars are better than rot.