Hi,Dear,
Thanks for the query to HCM. I studied your problem in depth and I understood your concerns.
Cause of painful lump in buttocks-In your case the cause of the lump,is traumatic
hematoma with tissue edema.
Cold Compresses.
Antibiotics to prevent infection of hematoma,
NSAIDs-tabs 1 x 2 times a day,
Aspiration of the mass,when it liquifies and compression bandage to reduce as soon as possible.
Consult ER Surgeon if his services are available nearby.
This advise is based on the facts from the history you give and needs further clinical check.
So don't build up wrong concepts and create more psychic complications in you which would increase risks and costs to you, but just ask a query to HCM and be comfortable to resolve your health issues.
Welcome for any more query in this regard to HCM.
Write good resume and Click thanks if you feel satisfied with my advise.
Have a Good Day.
Dr.Savaskar M.N.