It looks to me as if the scarring on the leaf triggered the leaf to grow a plant.... I would watch it, but I don't think it indicates anything significant or severe.

That said, the small calloused dots don't seem right. Looks kind of light some sort of pest damage.

Thanks for the responses! In terms of light, she gets roughly 4 hours of direct sunlight during the day and then another 5 from the grow light (red/blue LED bulb) for a total of 9 hours of direct light per day, plus 4 hours of indirect light.

I've been keeping my eye out for pests, but there haven't been any signs such as sticky residues, small movements, dark spots on leaves/stem. That's why I was thinking the scarring might be more sunburn damage.

I've put a bamboo skewer in the pot to test the soil moisture. It's a dusty mix plus perlite, and when I do water, some comes out the bottom. This makes me think the mix is well draining, but I know some get hydrophobic if they dry out too much. I've cut back on watering in the recent year or so because this plant suffered from basal rot due to too much water and not enough light. Luckily she bounced back, but I'm worried about a repeat.

Samantha

'Dusty' makes me think 'water retaining'. I see just a bit of perlite in photo, and it looks yellowish/discolored to me: this happens with too much water. So it was likely watered/kept wet in the past.

Maybe it is time to repot. I keep mine in gritty mix made of grit+sifted perlite (to get rid of dust and smallest particles) and smaller amount of turface. Pumice, if you have it, is good to use instead of perlite. Some ppl use mix of Cactus&Succulent soil and perlite, in 50/50 or 40/60% ratio. Either would give good drainage. If plant is in warm environment, it could be watered more often, thoroughly rather than in sips.

To stop mix falling/washed out of container, a piece of bug screening is of great help. Or any mesh with smaller holes, drywall tape is good too. Or plastic canvass sold in crafting store like Michaels.

If there is lots of peat in your mix, it could become hydrophobic if let to dry out completely, and very difficult to re-wet. So roots will not be getting any water, it will just 'slide' over the soil and make you think it drains well.

Scarring on the leaf could be mechanical damage that healed over, either from something falling/brushing against the leaf or chewing by bug or pest. It's hard to tell, but I do not think it has anything to do with light. Those small marks are bit peculiar to me too as palms pointed out. Are they on any other leaves or just that one?

Your lighting sounds OK. I do not really know LED grow lights as I do not use them. I keep succulents under light thru the winter, and outdoors as soon as weather is suitable. They are in full, direct sun (I consider 'direct' what is outdoors, not filtered thru the windows - but that's just me :).

All the bumps are from over watering. It usually happens on the older leaves first.

I repotted her a year ago into her current mix of succulent mix and perlite. How often should I be repotting? I'm worried about transplant shock. I'm monitoring her water intake carefully now. I think the damage occurred while she was being watched for a plant while I was away for a long time. I'm upping her time under the artificial light (slowly) given that it's too cold to take her outside. Hopefully that will take care of the issue.

In a partially organic mix like that, I would say 2 years max. By then or earlier you may be able to tell if the mix is holding up well or if it's compacting/leading to root health decline.

I keep going back to pic #3, to me hat wrinkling looks unusual. It is only 1 week since you posted, but how is the plant doing? Jades are quite resilient plant, I do not see too much of a transplant shock in general. Obviously, depends on overall health of the plant.

It's doing better with additional light and water. The leaves are firmer and more "normal" feeling. I haven't had a chance to repot it yet, but hope to soon.