A few years ago, I got a new Desert King. I foolishly allowed her to crawl inside a tall, narrow cactus. She got part way down, then had a bad time getting out.
Shortly afterward, I saw scales that appeared to have been "popped". They had slices in them, and appeared to be "deflated".
They started along the spine, crept down the sides. A few days later, she had difficulty crawling to the point I had to destroy her!
I think that the cactus spines either poisoned her internally, or did enough damage that some other condition occurred. When I posted on this forum at the time, nobody else had seen such symptoms.
I've never seen them since in any of 4 different types of Kings. I hope that you don't experience what I did.