By any chance would anyone know what mod could be doing this?

So, when I started the save my skin looked completely normal and now it has black/grey blotches. The second image is a new save of my skin being completely normal. I wanted to post all the mods in the modpack, but I am unsure how to do that, sorry. Originally I thought this was a MCA issue, but I can't seem to recreate the problem. Turning off and on the game doesn't help, and killing my character doesn't help.

This doesn't change how the game plays, it is just weird that it randomly happened.

Edit: When I made a world to take the second picture, I tried to go back to the first one with the issue.. It now says it is corrupted.. I am unsure why..