Yes, it is possible for there to be calcium in the leg causing it to have a lump.
I was kicked through my shin guards at a soccer game with the guys, one guy had hit my leg pretty hard causing in to bruise and become soft. It has now been 3 months and I still have the lump on my leg, doctors tell me that it is fine to continue playing, but I think there needs to be a second opinion, because now after tree months it has gone from having to feeling, to being the most painful experience when ever it is slightly touched.
If you have any thing to help with my problem please inform me.
I had the same problem, I was playing a soccer game and this guy kicked me really hard in the ankle. I was going to get it x-rayed but the doctor said it would probably go away by itself over time. Even if it doesn't go away if it isn't affecting your playing it should be ok. Mine went away after a couple months and now I only have a little bit of a bump on my ankle. Best thing to do once the bruising and swelling is gone is too massage it and apply pressure so the muscle and the tendon don't stiffen.
I've heard magnesium and vitamin D help as well.
I had the same thing from rugby as a teenager. I was stamped hard on the inside of the shin. The area went black within minutes. I forgot about it, and played later that week, and the next, but three weeks later I noticed my leg was agony every time it touched anything, even lightly. When I pulled up my trouser leg in class, I saw I had a large, hard lump in the area of the rugby injury.
The pain continued for several more days, and the lump appeared to swell. Then redness appeared. The red area began to creep up my leg when it was hot, and all the while, the pain grew worse and the lump, larger. So I went to the doctor. He ordered me into bed immediately for a week and put me on a course of anti-biotics. The redness spread rapidly up my leg when kept warm under the duvet. I had to keep a frame over my leg in bed to keep the heat off.
Thirteen years later, I am suffering the same thing. I can't remember how I was injured, but I must have been struck on the leg with a cricket ball. I have a hard, painful lump, ironically, in the same spot as the old rugby injury. Perhaps the bone has been chipped.
It's always worth getting these things checked out. If the area goes red, or if you get hot there, you must seek medical help immediately, or you could be in real danger.