Thanks for posting your query.
It might be soft tissue injury
. Big lump might be due to haematoma
formation(collection of blood) either due to ruture of microvasculature or bleeding from fracture ends.
Without X-ray, it is difficult to differentiate a fracture from others. I suggest you to consult an orthopaedician nearby for a detailed examination. He may get the X-ray of the area affected under his/her guidance.
In the interim,apply ice packs to the affected area,anti-inflammatory drug like motrin
half tablet with food to reduce pain and inflammation. Avoid lifting and rest well.
Wishing you good health...
Dr Saurabh Gupta.