NP, do you heat and ice it? Ive gotten it on the outer right side of my right knee when ive done something foolish like try to scrub a floor on my hands and knees, something i used to do almost for enjoyment in the olden days. Its a horrible thing your body creates. Bursa - a purse, a fluid-filled sac. Honestly i dont know how i made mine disappear. I was still taking ibuprofen back then though.