Respected user , hi
Thanks for using Healthcaremagic.com
I have evaluated your query thoroughly .
* This is due to post traumatic
hematoma formation .
* Continue ice application 3 - 4 times a day , with elevation of the arm till
possible .
In case it is large size , I would strongly recommend to consult your PCP
to get medications in form of antibiotics and anti inflammatory agents
which will -- prevent secondary infection
-- help early resolution of current lump
-- take care of pain component
Hope this clears your query .
Always feel welcome to ask further questions .
Wishing fine recovery from the same .
Regards .