Cat has strange crust on her side, what could it be?
I just noticed while I was petting my cat that there seems to be something hard under her fur, on her side. There is a single, hard, roundish crust on her left side, above her stomach and under her spine some 7cm, hidden in the fur, not noticeable unless by touch. It's dark reddish from what I can see, about 1.5cm in diameter, there is fur on it and around it, from what I can see, it looks like that entire patch of fur could be detached. She showed now interest in touching it, though she did become a bit agitated when I attempted to mess with the fur to find it. Not sure if due to pain. Never noticed this before, also never noticed any kind of hard surfaces resembling crusts (scabs?) on any other part of her body.
Any info would be appreciated.