Painn and swelling in thigh

I suffer from RA and have very painful knees which are swollen most of the time. Just lately though I have developed a swelling above my knee on the inner thigh, feels like fluid but very tender and sore to touch. Has anyone else got this problem ?

I had cortisone injection into this knee about 3 months ago. I am on full dose of MTX also - not doing too well on this drug and still in lot of pain in many joints.

Can anyone help regarding the swollen thigh ?

best wishes -Lynda