Tenderness and swelling in right side rib area below chest. Visible difference between left and right side was first noticed two years back. Severe pain which increased with twisting and turning was there. Ultrasound and blood test results were normal. The pain went away in few weeks but the swelling didn't go away. Once in a while (once in few months) pain and tenderness will be felt but the area looks swollen all the time. Is this something to worry about.