I have lump in my left leg ankle what is this? And I have done mri x-ray but nothing show, I have pain whole left leg and leg feel heavy tight and this lumb showing just 1 week but I suffer for this pain about 2 years running, blood test showing normal, only have low rbc level, pls suggest me is this sarcoma related? At night this pain bother me very much I could not sleep well, feeling fever some time at night,