<s>[INST] Hello I m 17 years old and I m starting to run again every day but i noticed that i have a lump that kind of bounced out a little when i bend my knee There is no pain but it worries me because i have gone through rehab once because my knee cap went to a side and then came back but this was about 5 years ago i also play soccer [/INST] Hi, Dear,Good evening. Thanks for the query to my Chat Doctor Clinic. I studied your query in depth. I am concerned about the worries you have. In my opinion, you have mostly-Morant Bakers Cyst-post old -dislocated [patella. This is the cause of the knee lump you have. This would fix your lump worry. Hope with this you would be relieved of your worrisome query. Wellcome again to Chat Doctor. Have a good Day. </s>