Thanks for your query. Am sorry about the injury
The lump is probably a contusion
with or without some bleeding inside it.
AS LONG AS YOU ARE ABLE TO MOVE ALL LIMBS FULLY AND, HAVE NO FUNCTIONAL ABNORMALITIES, the chances of injury to spine or other nerves are ruled out. Also, chances of a serious internal damage are minimal.
A 5-7 days course of anti-inflammatory pain-killers, such as, a combination of ibuprofen
will cure the lump in 7-10 days.
However, as a precautionary measure, consult your doctor, who will examine you for possible spine/bony injury.
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Fond regards and have a nice day
Dr. Rakesh Karanwal