Does anyone know what could be causing this on my leather???

[Homer12]

These spots just appeared, no spills or anything, any advice would be appreciated. It obviously doesn’t look good at all, very odd.

They’re both on cushions that are sat on regularly. I love my furniture but I’m now getting nervous about getting more of this. I don’t mind scratches and such, I think that adds to the look of unprotected leather, but this clearly isn’t a scratch.

Any thoughts on how I can make this less noticeable? It’s almost like the color/burnish went away in these spots.