I Have Arthritis In Both Knees. I've Been Doing The

I have arthritis in both knees. I've been doing the synvisc shots for several years now. I've developed a lump on the outside of my upper calf. My doctor doesn't know what it is. He's sending me to a surgeon. What could it be? It is hard and painful to the touch. It came up in the last week or so. It is about the size of a quarter. When looking at the past x-rays. It was not present at that time. So it is a recent develop
ment of two weeks.