Hello,

I recently bought a Hawthoria Turgida succulent, and it's been doing great, very big, very healthy. I have been careful about not watering it as it looked very watered hwen I first got it, and it's not had any issues.

At least until today.

I had left the windowsill open as it was good weather out, and then closed it when I went to bed. This morning, I found that a good chunk of the leaves had suddenly ROTTED overnight! They burst open, gooshy and yellow, as soon as you touched them. I got out as many as I could with tweezers and cleaned the spot; none of the other leaves seem affected

I have no clue what brought this on. It's not super cold out, it was still in the 70s when the window was open, and it didn't rain. I haven't watered it in over a week.

Is this plant infected or something else?