Shin hurts?

So about three months ago, my friend and I were at the park. We were racing to a merry-go-round. (I won). But anyways, when I got there, I hit my shin super hard on the side of it. I just laid in the grass for about ten minutes and couldnt move my leg. I limped for like a week. Now, three months later, I still have a small bruise from it. And when I run my finger over it, there is a small lump there that isnt there on the other leg. And then about a week ago I hit the same shin but a different area on a metal bar. REALLY REALLY REALLY HURTS.