Thanks for posting your query.
It might be soft tissue injury
. . Large lump might be due to haematoma
formation(collection of blood) from rupture of microvasculature or from bleeding 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. You 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
to reduce pain and inflammation. Avoid putting weight and rest well.
I hope this is helpful to you.
Wishing you good health...
Dr Saurabh Gupta