I have a lump on my left knee, its kinda big, about the size of a dollar coin. It's not right ON the knee, it's more to the left of it, like in the little groove area. It's most visible when I'm standing.
It doesn't really hurt when I touch it, but when I walk, I feel this pain in the back of my leg like I've pulled a muscle.
I haven't banged it or anything, and I haven't been exercising.
Any idea as to what it could be..?