Sorry the picture isn't great, she wouldn't sit at peace to let me take the photo.
Last week I noticed that from the inside of the ear it looked like a little bruise right at the top of the vein but there was nothing on the outside. But today I've noticed it's grown a white scab over the top on the outside of the ear. I initially thought she'd bumped it as she's always running around like a mad woman and she's an inside cat.
She seems fine otherwise and she's letting me touch it so doesn't seem to be in any pain.