Question about 96 monte carlo rear tires?

well i just got back from NC and we noticed that it was making a loud noise. so we felt all the tires and the rear tires have goose eggs all over them. now i also think my rims are bent. because the rear tires have a slight inward stance instead of straight. We checked my rear end and it dosent appear to be bent. So anyone have a idea why my rear tires are slightly inward