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It looks like it could be a couple things, but pics are hard to tell. We need more info.
Has it moved?
What is the movement like?
Is it hard or soft?
Can you get more pics?
Just going by pics above, it kinda looks like the beginning of a vermatid snail growing (I've never seen one start in the middle of live flesh). Was it there alreadyand the flesh grew around it?
It also looks like a flat worm kinda, and could be EEFW.
If it’s hard I think it’s a vermatid snail. I would take a pair of bone cutters and snip at the shell to break it. If you have peppermints in your tank they’ll clean it out....