Thanks for your query.
I came to know that you developed black eye due to trauma.
The lump that has formed may also be due to trauma,probably haematoma
(collection of blood).It will resolve spontaneously.
By X ray you can know bony injury and any soft tissue
Its better you get CT scan
,PNS view with the advice of your doctor.
Once your CT scan is over,it will be clear to go for medical treatment or surgical treatment
All the best.
Hope it is a minor problem.