This bump below your knee is a common problem. The bump is probably located right where the patellar tendon meets the bone. This junction can become inflamed and cause swelling and pain. This is a common problem in younger people often around the time of the adolescent growth spurt. When this occurs during this time of your life, we call this Osgood Schlatter's disease. During the rapid growth period of the leg bones. The patellar tendon tears away from the bone in small amounts causing pain and swelling. These small tears cause deposits of bone and calcium in the area that grow over time causing a more permanent bump. Most people with Osgood Schlatter's disease experience relief from the problem in their mid-late teenage years. Often the problem never prevents any sports or other physical activity. Rarely, some people experience some pain and swelling in their knees for many more years. There is no definitive treatment other than rest when the pain gets worse. There is usually no long term disability from the problem. The best type of physician for you to see for this issue is an orthopedic surgeon
. While there is no definitive operation that can help this problem, the orthopedic surgeon will be able to recommend treatments when your pain and swelling flair.