I have a hard lump, the size of a diffuse small walnut, on the outside of my knee . If I exercise too much (brisk walking), I feel considerable but easily bearable pain. Sometimes, I can walk miles with no pain; sometimes not. I m 65 years old and was diagnosed, when young, with a spinal tilt. I suspect that I have a benign condition and that it s the result of 64 years of walking slightly asymmetrically. Since it doesn t hurt at rest, I m not too worried but would appreciate reassurance and advice about possible treatment. Thank you.