I have a peaceful sized lump in right knee cap. it moves around under my skin. no pain. i'm just curious.

Exam please: All lumps should be checked to make certain they are not cancer. The earlier cancer is diagnosed the better the chances are for a cure. I therefore suggest that you go to a medical clinic for an exam as soon as possible. And remember to always maintain a healthy diet, get adequate sleep at night, exercise daily or as often as possible and avoid smoking, illicit drugs and drinking too much alcohol.