I have a painless hard lump on the bone running down the front of my leg.  It is about 31/2 inches up from my ankle.  It is clearly visible, does not move, does not cause pain in the leg, & there is no color change.  I probably noticed it about five months ago.  I should also say that I have lost about 130 pounds over the past two years, & that I sometimes get Charlie Horses in my calves.
Hi! Good evening. I am Chat Doctor answering your query. As it needs a clinical assessment of the lump to comment on it specially with a history of this kind of weight loss you wrote, I would advise you to consult a general surgeon/orthopedic surgeon in your area, who might investigate you radiologically before opining on the same. Thanks for choosing Chat Doctor to clear doubts on your health problems. I wish you an early recovery. Chat Doctor.