I have a friend who has a bubble under his knee cap from the time when he was playing soccer a lot. It doesn t hurt for him now, but I want to know if this can become worse by itself if he doesn t do much sports, or he is good as long as he doesn t strain his knees.
Hello, I read carefully your query and understand your concern. The symptoms of your friend see to be related to bursitis. Bursitis is inflammation of the bursa. A bursa is a small sac of fluid that cushions the knee and helps it move easily. In case of bursitis it is recommended physical therapy and moderate exercise. I this not recommend doing too many sports. Hope my answer was helpful. If you have further queries feel free to contact me again. Kind regards!  Chat Doctor.