Hi,
Noted your history of being beaten by ex boyfriend and hitting head on corner of the speaker, development of a bump on head that is sore.
Since the injury was long ago and the lump persisted means there was
hematoma.
Over time the hematoma usually resolves but persistence means it underwent the changes of organization as well call, causing the lump to persist.
Since there is soreness it is possible that there is some nerve involvement in the scar or organized hematoma or development of an
abscess or so.
I would advise you the following in such a situation:
Consult a General Surgeon for an actual examination.
CT scan of the affected area and brain as you had
unconsciousness then.
Further management as per the cause found.
So not self treat or apply anything over it.
Till then take a painkiller with anti-inflammatory property like
Ibuprofen if it suits you.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. T. Chandrakant, General Surgeon