Looks like sunburn, but cannot say for sure. If it is sunburn, place the plant on a light place out of the sun. Water and spray a bit.

I cannot see your soil very well, so cannot say anything about it, but it looks quite fat and not drainable. Maybe I'm wrong.

That looks like sunburn to me. When you first buy them be sure to slowly acclimate to sun. These succulents are grown in green houses and then go to big box stores or nurseries where they are usually protected by overhang or some type of shading.

We buy them and think since they’re succulents they can handle strong sun, but that’s not that case. Many succulents do better with morning sun afternoon shade or visa versa.

edit: I was writing while Harry put his comment up. Glad we agree it’s sunburn:).

Looks like a sunburn to me. Did you acclimatize them to sun and what is their exposure? They can take good sunlight but will burn if exposed suddenly. It is difficult to know what conditions they were before, so better be sure than sorry. They should have powdery coating on leaves - it protects them - and that shouldn't be rubbed off. At the same time, they look bit etiolated. I have same plants, and see the difference between plant indoors (left) and outdoors (right):

ETA: lots of comments and we all agree it is sunburn :) Good news, since the leaves will eventually grow out (it may take a while), and easier to manage than rot.

Hi Chrissy. I think I also have this plant or at least very similar. I keep mine outside on a table with an umbrella so it gets bright but filtered indirect sunlight.

When I first got it the leaves were just so irresistibly touchable ...so... I touched. What I wound up doing was “touching” the protective layer off of the leaves making them rather unsightly.

My understanding is that these leaves have a protective layer so if it’s rubbed off the plant might get sunburned. Once rubbed off that layer is gone. The plant doesn’t replace it. Like other mechanical damage or sunburn it remains until those leaves get old, dry up & fall off or are otherwise removed.

Might that have happened with your plant?

Tyler

Edited to add:

Sorry for all of the duplicate info. My phone indicated that no one had replied yet. After I posted it refreshed and I saw the other replies.