I've fostered and nursing cat before and I worked at a cattery for a while so I know that after a while nursing cats get a little lumpy. As expected, Molly started getting bruised and swollen the day before yesterday (the kittens teeth just came in).. but one of her nipples has like a hard rectangular plate under it.. I'm going to draw the shape in MS paint so you guys can have a better idea. It's about 2 inches by 3... and it stands an inch above normal skin level. I can clearly feels the edges. The skin around it is tight. Has anyone ever seen this before?