What looks like bruising on Lc. Fire Dance Patricia :(

[butterfly_muse]

Evening, guys!

I can't figure out what is going on on my Lc. Fire Dance Patricia's leaf. It looks almost like a human bruise would, but on the leaf. But when you hold the leaf up and look through it, it has tons of little black dots inside of it.

I recently moved all of my plants underneath of two LED lights for the winter, and it has come up since then, so I am wondering if it's "sunburn"? The surrounding leaves also look to have some yellow mottling in them, but the larger leaves are fine. It has also put out one whole new growth which is growing a sheath now, and you can see the second, smaller growth it's pushing up.

I have attached pictures of the leaf in question, surrounding leaves, and the whole plant.

What is this and how can I fix it, if it can be fixed?