That's the best way I could describe it in the subject line.
Ash's fur is thinning and/or missing in patches on her ears. When I get home later, I will try and post pictures. It's not a lot, but it's noticeable. The top right ear almost looks nicked, like someone took a little bite out of her, but upon closer inspection you see that the fur is missing completely on that little patch. Then a few days later I noticed that the fur on the rim of her left ear is thinning so much that it looks like it's gone.
They don't seem to be bothering her. I don't see her messing with her ears. When I touch them, she tries to get away, but she doesn't whine. Eventually, she just lays there as I inspect them. What could this be?