I hit my shin now i have a hematoma on it would like to know if i can dissolve it - bump as large as a half of a golf ball?

It will: It's going to take a pretty long time and you may always have a small lump there. If you get numbness, severe pain or purplish toes you need to go to the ER right away.

Not Really: You are probably correct that you have a trauma-induced hematoma. You can try applying ice to the area to reduce the swelling and further bleeding. Your body should re-absorb the excess blood and fluid over the course of the next week. If you take a blood thinner, aspirin or NASAID (Motrin, Aleve) for any reason, these medications may slow the resolution of the hematoma.