my b/f has a large lump, golf ball size, at his knee... he went to the ER last night, they gave him a shot and a prescription for pain meds. its worse tonight, its swollen big time. they ruled out gout and a possible spider bite. what do you think it could be?
Hi. It could be synovial effusion or collection of fluid inside the knee joint. You might need an Ultrasound to be sure. So please contact your Doctor or your Orthopaedician. He would be better able to advice you. I suggest you get it evaluated. You can tell us after the check-up for further advice on treatment. Take care.  Chat Doctor.