<s>[INST] I got hit with a ball on my inner knee.I went to the hospital and they said it was sprained..a month later Ihad to get physical therapy ... my knee is very larger then the other.. I have a little ball on my knee that I can move and it seems to grow...what can it be? [/INST] HelloIt is difficult to diagnose accurately without physical examination. Some times such condition arises after physical trauma. Muscle of affected area becomes hard. I would suggest you to consult any physician for proper diagnosis. Meanwhile you can start with Homeopathic treatment . Medicine helps to treat muscle injury. You can start with Arnica 30 6 pills twice in dayRhus tox 30 6 pills twice in day This will help to solve your problem Take medicine for 15 days Thanks Dr Ratnesh </s>