It doesn't seem to hurt her, and google suggests that it's almost certainly nothing (and possibly one of her ribs, in fact) so I'll leave this to her next scheduled appointment at the end of the month.
One of my cats had a lump on the underside of her ribs. I freaked out, too, but it turns out she'd broken her rib some years before we got her, and the lump was just a piece of broken bone that had healed wonky.
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Date: 2019-06-14 03:44 pm (UTC)I hope it is as benign as this!