Hi, im ashlyn. I was diagnosed with scoliosis when I was 12. And I've always had this abnormal swelling in my lower back. I don't have an arch in my lower back, where as everyone else does. They did an ultrasound not too long ago, because they said its definitely not normal, and doesn't look normal, but the ultrasound came back negative for fluid or mass. I don't know what it could be. Ive tried losing weight, thinking maybe it was just excess weight around my lower back, but it won't go away. Please help.